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Space rate of variation of pressure in a given direction
In hydrodynamics and hydrostatics, the pressure gradient (typically of air but more generally of any fluid) is a physical quantity that describes in which
Pressure_gradient
Force resulting from a difference in pressure across a surface
mechanics, the pressure-gradient force is the force that results when there is a difference in pressure across a surface. In general, a pressure is a force
Pressure-gradient_force
Pressure exerted by circulating blood upon the walls of arteries
Blood pressure (BP) is the pressure of circulating blood against the walls of blood vessels. Most of this pressure results from the heart pumping blood
Blood_pressure
Movement of molecules to lower concentration
Osmotic transport occurs through viscous flow of the solvent under a pressure gradient. Osmosis is a vital process in biological systems, as biological membranes
Osmosis
Physical quantity
or Euler equations (fluid dynamics) for ideal inviscid fluid, the gradient of pressure becomes a function of body forces only. The Navier-Stokes momentum
Hydrostatic_pressure
Pressure gradient in which pressure increases in the direction of fluid flow
In fluid dynamics, an adverse pressure gradient is a pressure gradient in which the static pressure increases in the direction of the flow. Mathematically
Adverse_pressure_gradient
Detachment of a boundary layer from a surface into a wake
a flow is slowing pressure is increasing. Flowing against an increasing pressure is known as flowing in an adverse pressure gradient. The boundary layer
Flow_separation
State of balance between external forces on a fluid and internal pressure gradient
such as gravity, are balanced by a pressure-gradient force. In the planetary physics of Earth, the pressure-gradient force prevents gravity from collapsing
Hydrostatic_equilibrium
Concept in petrophysics
Pore pressure gradient is a dimensional petrophysical term used by drilling engineers and mud engineers during the design of drilling programs for drilling
Pore_pressure_gradient
Principle relating to fluid dynamics
caused by pressure gradients. Air is accelerated in the direction of the velocity if the pressure goes down. Thus the decrease of pressure is the cause
Bernoulli's_principle
Air pressure differential between two areas
movement of gases or liquids along a pressure gradient with the implication that the movement occurs because the lower pressure pulls the gas or liquid. However
Suction
Model of atmospheric motion
to the lower pressures, the effective pressure vector force is contrary to the pressure gradient, whence the minus sign before the gradient vector. Friction
Balanced_flow
Energy density associated with a magnetic field
of gas molecules. A gradient in field strength causes a force due to the magnetic pressure gradient called the magnetic pressure force. In SI units, the
Magnetic_pressure
Law describing the pressure drop in an incompressible and Newtonian fluid
pipes with an oscillating pressure gradient finds applications in blood flow through large arteries. The imposed pressure gradient is given by ∂ p ∂ x = −
Hagen–Poiseuille_equation
a pressure gradient, such that air parcels are accelerated away from regions of high pressure and toward regions of low pressure. A strong pressure gradient
Glossary_of_meteorology
Model of viscous fluid flow between two surfaces moving relative to each other
Depending on the definition of the term, there may also be an applied pressure gradient in the flow direction. The Couette configuration models certain practical
Couette_flow
Management of oil wells
in terms of its pressure gradient. The SI unit is pascals/metre. The hydrostatic pressure gradient can be written as: Pressure gradient (psi/ft) = HSP/TVD
Oil_well_control
Blood pressure in the hepatic portal vein
Hepatic venous pressure gradient (HVPG) is a clinical measurement of the pressure gradient between the WHVP and the free hepatic venous pressures (FHVP), and
Portal_venous_pressure
Flow with periodic variations
flow simply oscillates as a plug profile in time according to the pressure gradient ρ ∂ u ∂ t = − ∑ n = 0 N P n ′ . {\displaystyle \rho {\frac {\partial
Pulsatile_flow
Apparent force in a rotating reference frame
between the pressure-gradient force acting towards the low-pressure area and the Coriolis force acting away from the center of the low pressure. Instead
Coriolis_force
Net pressure gradient causing cerebral blood flow to the brain
Cerebral perfusion pressure (CPP) is the net pressure gradient causing cerebral blood flow to the brain (brain perfusion). It must be maintained within
Cerebral_perfusion_pressure
Deflection of a spinning object moving through a fluid
above and below the cylinder is curving downwards, accelerated by the pressure gradient. A downwards force is acting on the air. Newton's third law predicts
Magnus_effect
Generalized model of a non-Newtonian fluid
flow only in the horizontal direction (along the pressure-gradient direction), and the pressure gradient and viscous effects are in balance. Then, the Navier-Stokes
Herschel–Bulkley_fluid
Tropical atmospheric circulation feature
at higher latitudes, a pressure gradient develops near the surface with lower pressures near the equator and higher pressures in the subtropics; this
Hadley_cell
Device that converts sound into an electrical signal
back at the same time creates no gradient between the two. The characteristic polar pattern of a pure pressure-gradient microphone is a figure-8. Other
Microphone
Excess accumulation of fluid in the brain
osmolality pressure gradient between the brain and the surrounding vasculature. As cerebral edema is linked to increased intracranial pressure (ICP), many
Cerebral_edema
Force distributed over an area
atmospheric pressure. In the case of planetary atmospheres, the pressure-gradient force of the gas pushing outwards from higher pressure, lower altitudes
Pressure
Movement of water from the Pacific to the West Philippine/South China Sea
the cross-Luzon Strait pressure gradient, thereby supporting this theory. However, the exact mechanism for a pressure gradient-induced intrusion is not
Kuroshio_Current_Intrusion
Mathematical descriptions of molecular diffusion
{p_{i}-p_{0}}{\delta }}} is the partial pressure gradient. As a result, Fick's first law tells us we can use a partial pressure gradient to control the diffusivity
Fick's_laws_of_diffusion
Transport of dissolved species from the highest to the lowest concentration region
that substance or collection. A gradient is the change in the value of a quantity; for example, concentration, pressure, or temperature with the change
Diffusion
Process of moving air in and out of the lungs
lungs halves the pressure in the lungs at any altitude. Halving the sea level air pressure (100 kPa) results in a pressure gradient of 50 kPa but doing
Breathing
Oceanic flow in which the pressure gradient force is balanced by the Coriolis effect
the pressure gradient force is balanced by the Coriolis effect. The direction of geostrophic flow is parallel to the isobars, with the high pressure to
Geostrophic_current
Tendency of a fluid jet to stay attached to a surface of any form
and wall surface pressures of the jet, creating a pressure gradient depending upon h/r, the relative curvature. This pressure gradient can appear in a
Coandă_effect
Equation describing the flow of a fluid through a porous medium
if there is no pressure gradient over a distance, no flow occurs (these are hydrostatic conditions), if there is a pressure gradient, flow will occur
Darcy's_law
Narrowing of the exit of the heart's left ventricle
is caused by the constant production of increased pressure required to overcome the pressure gradient caused by the AS. While the muscular layer of the
Aortic_stenosis
Flow of fluids with zero viscosity (superfluids)
solid surfaces. Outside these regions, and in regions of favorable pressure gradient, viscous shear forces are absent so the fluid flow field can be assumed
Inviscid_flow
Concept in atmospheric science
would result from an exact balance between the Coriolis force and the pressure gradient force. This condition is called geostrophic equilibrium or geostrophic
Geostrophic_wind
Continuous band of stars that appears on plots of stellar color versus brightness
out from the hot, dense core, generating a strong pressure gradient. It is this pressure gradient that counters the star's collapse under gravity, maintaining
Main_sequence
Equations of motion for viscous fluids
the sum of a diffusing viscous term (proportional to the gradient of velocity) and a pressure term—hence describing viscous flow. The Navier–Stokes equations
Navier–Stokes_equations
Area with air pressures lower than adjacent areas
low-pressure areas in advance of their associated cold fronts. The stronger the pressure difference, or pressure gradient, between a high-pressure system
Low-pressure_area
Sustainable energy from sea and river water
salinity gradient. One method to utilize salinity gradient energy is called pressure-retarded osmosis. In this method, seawater is pumped into a pressure chamber
Osmotic_power
U-shaped lake or pool left by an ancient river meander
move fast enough to balance the pressure gradient laterally across the river. It responds to this pressure gradient, and its velocity is partly downstream
Oxbow_lake
Movement of fluids down a pressure or temperature gradient
transfer and bulk flow, is the movement of fluids down a pressure gradient or a temperature gradient. As such, mass flow is a subject of study in both fluid
Mass_flow_(life_sciences)
Architectural element for creating a draft
a pressure gradient to draw air through the building. Windtowers topped with horizontal airfoils have been built to enhance these pressure gradients. The
Windcatcher
Type of magnetohydrodynamic instability
drift wave is a type of collective excitation that is driven by a pressure gradient within a magnetised plasma, which can be destabilised by differences
Drift_waves
Two-dimensional laminar boundary layer that forms on a semi-infinite plate
similarity model corresponding to the flow for the case where the pressure gradient, ∂ p {\displaystyle {\partial p}} / ∂ x {\displaystyle {\partial x}}
Blasius_boundary_layer
Genus of amphibians
pressure gradient alone was not enough to drive respiration in the Amphiuma tridactylum. Rather, the buccal cavity allows for small pressure changes that
Amphiuma
Gas centrifuge designed to enrich uranium-235
enriched at the inside of this layer. The centrifugal force creates a pressure gradient: On the axis of the centrifuge there is practically vacuum, so that
Zippe-type_centrifuge
Measure of water potential across a semi-permeable cell membrane
chemical biology, tonicity is a measure of the effective osmotic pressure gradient; the water potential of two solutions separated by a partially-permeable
Tonicity
Gradient whose components are spatial derivatives
Potential gradient, the difference in electric charge between two adjoining regions Fluid dynamics and earth science Density gradient Pressure gradient Temperature
Spatial_gradient
1989 tornado in Bangladesh
from Madhya Pradesh, and in conjunction with a ridge over China, the pressure gradient became tighter across Bangladesh. Warm, moist air flowed northeast
Daulatpur–Saturia_tornado
Ribbon microphone
RCA Type 44 microphone is a bi-directional ribbon microphone, or pressure-gradient microphone, first introduced by the RCA Corporation in 1931. Dr. Harry
RCA_Type_44
Process of water movement through a plant
roots: the hydraulic conductivity of the soil and the magnitude of the pressure gradient through the soil. Both of these factors influence the rate of bulk
Transpiration
Force perpendicular to flow of surrounding fluid
path, there is a pressure gradient perpendicular to the flow direction with higher pressure on the outside of the curve and lower pressure on the inside
Lift_(force)
Measure of misalignment between the gradients of pressure and density in a fluid
a stratified fluid is a measure of how misaligned the gradient of pressure is from the gradient of density in a fluid. In meteorology, a baroclinic flow
Baroclinity
Aerodynamic instability in axial or centrifugal compressors
The pressure in the reservoir keeps increasing and then exceeds the pressure at compressor exit, thus resulting in an adverse pressure gradient in exit
Surge_in_compressors
Boundary layer that forms on a wedge
It is also representative of flow on a flat plate with an imposed pressure gradient along the plate length, a situation often encountered in wind tunnel
Falkner–Skan_boundary_layer
Rate at which air moves from high- to low-pressure areas
direction, notably with the pressure gradient and terrain conditions. The Pressure gradient describes the difference in air pressure between two points in the
Wind_speed
Oscillating boundary layer over a plate
y^{2}}}} where ν {\displaystyle \nu } is the kinematic viscosity. The pressure gradient does not enter into the problem. The initial, no-slip condition on
Stokes_problem
Region of rotation within a powerful thunderstorm
air moves towards the center of low pressure, adjacent air parcels flowing across the updraft's pressure gradient begin rotating at different rates relative
Mesocyclone
Fracturing bedrock by pressurized liquid
is controversial, or the injection pressure applied (whether the treatment is above or below the fracture gradient, as shown in the flow chart above)
Fracking
Monsoon in Indian subcontinent
up at a different rate than the surrounding seas, resulting in a pressure gradient from south to north. This causes the flow of moisture-laden winds
Monsoon_of_South_Asia
Millennium Prize Problem
medium, density and viscosity are constants. Since only its gradient appears, the pressure p can be eliminated by taking the curl of both sides of the
Navier–Stokes existence and smoothness
Navier–Stokes_existence_and_smoothness
Common weather phenomenon in San Francisco
above 100 °F (38 °C). This significant difference creates a strong pressure gradient that turns the prevailing northwest flow to a westerly and even southwesterly
San_Francisco_fog
because of pressure gradients. Ptp = Palv – Pip Where Ptp is transpulmonary pressure, Palv is alveolar pressure, and Pip is intrapleural pressure. Since atmospheric
Transpulmonary_pressure
Fluid-filled space between the lungs
to enable lubrication between the membranes, and also to create a pressure gradient. The serous membrane that covers the surface of the lung is the visceral
Pleural_cavity
Set of quasilinear hyperbolic equations governing adiabatic and inviscid flow
pressure gradient normal to the streamline because the centripetal acceleration of the fluid parcel is only generated by the normal pressure gradient
Euler equations (fluid dynamics)
Euler_equations_(fluid_dynamics)
Explains movement of sap through the phloem of plants
gradient (osmotic gradient) that draws water into the cells from the adjacent xylem. This creates turgor pressure, also called hydrostatic pressure,
Pressure_flow_hypothesis
Enlargement of the heart muscle
A8V, A31S, C84Y and D145E. Ventricular hypertrophy causes a dynamic pressure gradient across the left ventricular outflow tract (LVOT), which is associated
Hypertrophic_cardiomyopathy
Variation in pressure as a function of elevation
elevation as well, and these variations have relevance in the context of pressure gradient force and its effects. However, the vertical variation is especially
Vertical_pressure_variation
Microphone for live news reporters
microphone is subject to increased bass when used at close proximity in pressure gradient mode. Distant sources are not affected by this. However, increasing
Lip-ribbon_microphone
1000-km-order method of measuring weather systems
that the main terms in horizontal equations are Coriolis force and pressure gradient terms; therefore, one can use geostrophic approximation. In vertical
Synoptic_scale_meteorology
Ratio of inertial to viscous forces acting on a liquid
proportional to the square root of the pressure gradient, as opposed to its direct proportionality to pressure gradient in laminar flow. Using the definition
Reynolds_number
Vector difference of geostrophic wind movement at high and low altitudes
complicated horizontal flow balances such as gradient wind balance. Since the geostrophic wind at a given pressure level flows along geopotential height contours
Thermal_wind
Cardiothoracic surgical process
excessive pressure gradient across the natural valve. High pressure gradient across the aortic valve can be congenital or acquired. A reduction in pressure gradient
Apicoaortic_conduit
Technique in analytical chemistry
High-performance liquid chromatography (HPLC), formerly referred to as high-pressure liquid chromatography, is a chromatography technique in analytical chemistry
High-performance liquid chromatography
High-performance_liquid_chromatography
Replacement of a valve in the human heart
transvalvular pressure gradient – Whenever a fluid flows through a restriction, such as a valve, a pressure gradient arises over the restriction. This pressure gradient
Artificial_heart_valve
Energy per volume
difference between the gas pressure and the external pressure by the change in volume. A pressure gradient describes the potential to perform work on the surroundings
Energy_density
Device used to stop blood loss in an emergency
near the cuff edges. A high rate of change of pressure across the cuff width, or a high cuff pressure gradient, is a leading cause of nerve and muscle injury
Emergency_tourniquet
Set of partial differential equations on fluid flow
that vertical pressure gradients are nearly hydrostatic, and that horizontal pressure gradients are due to the displacement of the pressure surface, implying
Shallow_water_equations
Measurement of the area of the heart's aortic valve
the aortic valve during ventricular systole divided by the systolic pressure gradient across the valve times a constant. The flow across the aortic valve
Aortic_valve_area_calculation
Short-term state of the atmosphere
surface air pressure. The resulting horizontal pressure gradient moves the air from higher to lower pressure regions, creating a wind, and the Earth's rotation
Weather
Translational forces on bubbles in a sound wave
\nabla } P is the acoustic pressure gradient on the bubble. Assuming a sinusoidal standing wave, the time-averaged pressure gradient over a single acoustic
Bjerknes_force
Relatively minor flow superimposed on the primary flow by inviscid assumptions
tornado or dust devil the air pressure is low. There is a pressure gradient toward the center of the vortex. This gradient, coupled with the slower speed
Secondary_flow
Insertion of a catheter into a chamber or vessel of the heart
across the valve and measuring the pressures simultaneously on each side of the valve to obtain the pressure gradient. In conjunction with a right heart
Cardiac_catheterization
Type of cyclone
point gradient with significant vertical wind shear, and are thus classified as baroclinic cyclones. Initially, cyclogenesis, or low pressure formation
Extratropical_cyclone
Abnormally increased portal venous pressure
as increased portal venous pressure, with a hepatic venous pressure gradient greater than 5 mmHg. Normal portal pressure is 1–4 mmHg; clinically insignificant
Portal_hypertension
California weather phenomenon
California, can change the stability of the Great Basin High, causing a pressure gradient that turns the synoptic scale winds southward down the eastern side
Santa_Ana_winds
Fluid flow revolving around an axis of rotation
separation can also occur in the presence of combatting pressure gradients (i.e. a pressure that develops downstream). This is present in curved surfaces
Vortex
Last part of the digestive system in vertebrates
transmucosal osmotic pressure gradient. The standing gradient osmosis is the reabsorption of water against the osmotic gradient in the intestines. Cells
Large_intestine
the summer months form a low pressure system called the Chaco Low over northern Argentina, generating a pressure gradient that brings moist easterly winds
Climate_of_Buenos_Aires
Coronary perfusion pressure (CPP) refers to the pressure gradient that drives coronary blood pressure. The heart's function is to perfuse blood to the
Coronary_perfusion_pressure
Sudden movement of the Earth's crust
the mainshock, the pressure gradient between the fault plane and the neighboring rock causes a fluid flow that increases pore pressure in the surrounding
Earthquake
Fast-flowing atmospheric air current
process of warmer air increases pressure levels which decreases poleward geopotential height gradients. As these gradients are the reason that cause west
Jet_stream
Medical device for restricting blood flow
minimizing tourniquet pressure and pressure gradients. Tourniquet pressure and pressure gradients can be minimized by using a tourniquet pressure based on the
Tourniquet
Fluid-filled space in organs
other circumstances display a high-pressure gradient at their periphery. Changes in interstitial volume and pressure play critical roles in the onset of
Interstitium
Measure of the ability of a porous material to allow fluids to pass through it
rate) and fluid physical properties (e.g. dynamic viscosity), to a pressure gradient applied to the porous media: v = k η Δ P Δ x {\displaystyle v={\frac
Permeability_(porous_media)
Development and strengthening of a tropical cyclone in the atmosphere
atmospheric forces in play are the pressure gradient force (the pressure difference that causes winds to blow from high to low pressure) and a smaller friction force;
Tropical_cyclogenesis
Cryogenic device for cooling to very low temperatures
which is at rest. The 3He is driven through the dilute channel by a pressure gradient just like any other viscous fluid. On its way up, the cold, dilute
Dilution_refrigerator
Heart disease with narrowing of valve
creating a pressure gradient across the mitral valve. This gradient may be increased by increases in the heart rate or cardiac output. As the gradient across
Mitral_stenosis
PRESSURE GRADIENT
PRESSURE GRADIENT
Girl/Female
Tamil
Upkosha | உபà¯à®•à¯‹à®·à®¾
Treasure
Upkosha | உபà¯à®•à¯‹à®·à®¾
Girl/Female
Indian
Treasure
Surname or Lastname
English (Bristol, Gwent)
English (Bristol, Gwent) : from Middle English tresor ‘treasure’, ‘wealth’, ‘riches’ (Old French trésor, from Latin thesaurus ‘hoard’), hence a metonymic occupational name for a treasurer or person in charge of financial administration, or an affectionate nickname for a loved or valued person.
Boy/Male
Tamil
Khazana | க஼ஜ஼ாநாÂ
Treasure
Khazana | க஼ஜ஼ாநாÂ
Boy/Male
British, English
From the Priest's Meadow
Girl/Female
Muslim
Treasure
Boy/Male
Tamil
Pleasure
Girl/Female
Muslim
Treasure
Girl/Female
Tamil
Abhirathi | அபிரதீ
Pleasure
Abhirathi | அபிரதீ
Girl/Female
Hindu
Treasure
Boy/Male
Tamil
Treasure
Boy/Male
Indian
Pleasure
Girl/Female
Indian
Treasure
Boy/Male
Indian
Pleasure
Boy/Male
Tamil
Treasure
Boy/Male
Hindu
Pleasure
Girl/Female
Tamil
Treasure
Girl/Female
Arabic, Muslim, Sindhi
Treasure of Heaven; Treasure
Surname or Lastname
English
English : nickname from Old French prestre ‘priest’.German : derogatory nickname for a bully or tyrant, from an agent noun derivative of pressen ‘to oppress’.Jewish (Ashkenazic) : occupational name for someone who did ironing, from Yiddish pres ‘flat iron’ + the agent noun suffix -er.
Girl/Female
Muslim
Treasure
PRESSURE GRADIENT
PRESSURE GRADIENT
Girl/Female
English
A climbing evergreen ornamental plant.
Boy/Male
Australian, Celtic, Irish
Wise; Hound; Wolf; High
Boy/Male
Celebrity, Hindu, Indian, Marathi, Tamil
Brave
Girl/Female
Indian, Traditional
Divine
Girl/Female
Indian, Kannada
Made of Oak
Girl/Female
Hindu, Indian, Marathi
Beautiful
Surname or Lastname
English
English : occupational name for a maker of measures or a measurer, derived from Old French moule ‘measure’.
Boy/Male
Muslim/Islamic
Ancient Noble
Girl/Female
Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
A Creeper with Dusky Leaves
Girl/Female
Tamil
Walking in three paths, Young woman
PRESSURE GRADIENT
PRESSURE GRADIENT
PRESSURE GRADIENT
PRESSURE GRADIENT
PRESSURE GRADIENT
a.
Pressing; urgent; also, oppressive; as, pressive taxation.
v. i.
To suppose or assume something to be, or to be true, on grounds deemed valid, though not amounting to proof; to believe by anticipation; to infer; as, we may presume too far.
n.
The act of pressing, or the condition of being pressed; compression; a squeezing; a crushing; as, a pressure of the hand.
v. t.
To give or afford pleasure to; to please; to gratify.
n.
Pressure.
n.
Pressure acting within.
a.
Having equal pressure.
n.
Affliction; distress; grievance.
a.
Indicating equal barometric pressure.
n.
A contrasting force or impulse of any kind; as, the pressure of poverty; the pressure of taxes; the pressure of motives on the mind; the pressure of civilization.
a.
Having, employing, or exerting, a low degree of pressure.
n.
The action of a force against some obstacle or opposing force; a force in the nature of a thrust, distributed over a surface, often estimated with reference to the upon a unit's area.
v. t.
To collect and deposit, as money or other valuable things, for future use; to lay up; to hoard; usually with up; as, to treasure up gold.
v. i.
To take pleasure; to seek pursue pleasure; as, to go pleasuring.
a.
Fig.: Urgent; intense; as, a high-pressure business or social life.
n.
Urgency; as, the pressure of business.
a.
Having or involving a pressure greatly exceeding that of the atmosphere; -- said of steam, air, water, etc., and of steam, air, or hydraulic engines, water wheels, etc.
a.
Causing, or giving rise to, pressure or to an increase of pressure; as, pressor nerve fibers, stimulation of which excites the vasomotor center, thus causing a stronger contraction of the arteries and consequently an increase of the arterial blood pressure; -- opposed to depressor.
a.
Provided or bound with a tressure; arranged in the form of a tressure.
n.
Impression; stamp; character impressed.