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State of balance between external forces on a fluid and internal pressure gradient
In fluid mechanics, hydrostatic equilibrium, also called hydrostatic balance and hydrostasy, is the condition of a fluid or plastic solid at rest, which
Hydrostatic_equilibrium
ellipsoidal shape due to their own gravity (but are not necessarily in hydrostatic equilibrium). Apart from the Sun itself, these objects qualify as planets according
List of gravitationally rounded objects of the Solar System
List_of_gravitationally_rounded_objects_of_the_Solar_System
Small planetary-mass object
with hydrostatic equilibrium for its current spin. They hypothesized that Quaoar originally had a rapid rotation and was in hydrostatic equilibrium, but
Dwarf_planet
Branch of fluid mechanics that studies fluids at rest
Hydrostatics is the branch of fluid mechanics that studies fluids at hydrostatic equilibrium and "the pressure in a fluid or exerted by a fluid on an immersed
Hydrostatics
Planetary-mass bodies that are also natural satellites
are large and ellipsoidal (sometimes spherical) in shape due to hydrostatic equilibrium caused by internal partial melting and differentiation and/or from
Planetary-mass_moon
International Astronomical Union (IAU) defines dwarf planets as being in hydrostatic equilibrium, and notes six bodies in particular: Ceres in the inner Solar System
List of possible dwarf planets
List_of_possible_dwarf_planets
Dimensionless astrophysics equation
fluid, one obtains the Emden–Chandrasekhar equation. Physically, hydrostatic equilibrium connects the gradient of the potential, the density, and the gradient
Lane–Emden_equation
Large, round non-stellar astronomical object
electromagnetic forces binding its physical structure, leading to a state of hydrostatic equilibrium. This effectively means that all planets are spherical or spheroidal
Planet
self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) state. Object has cleared the neighbourhood around
Definition_of_planet
When the net force on a particle is zero
Applied mechanics Dynamic equilibrium (mechanics) Metastability Statically indeterminate Statics Hydrostatic equilibrium John L Synge & Byron A Griffith
Mechanical_equilibrium
Trans-Neptunian object
standard hydrostatic equilibrium, this would require an even faster 4.5-hour period. So, astronomers have also considered that Varda has a non-hydrostatic equilibrium
174567_Varda
Physical quantity
Hydrostatic pressure is the static pressure exerted at a point of interest by the weight of a fluid column above the point. Due to the fundamental nature
Hydrostatic_pressure
Natural satellites of the planet Uranus
ellipsoidal, indicating that they reached hydrostatic equilibrium at some point in their past (and may still be in equilibrium), and four of them show signs of
Moons_of_Uranus
2006 International Astronomical Union definition
that: is in orbit around the Sun, has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and has "cleared the neighbourhood" around
IAU_definition_of_planet
Astronomical bodies relax into rounded shapes (spheroids), achieving hydrostatic equilibrium, when their own gravity is sufficient to overcome the structural
List of Solar System objects by size
List_of_Solar_System_objects_by_size
Ringed dwarf planet in the Kuiper belt
(560 mi) in diameter should relax into hydrostatic equilibrium, whereas icy bodies relax into hydrostatic equilibrium somewhere between 200 km (120 mi) and
Quaoar
Natural physical entity in space
process to reach a roughly spherical shape, an achievement known as hydrostatic equilibrium. The same spheroidal shape can be seen on smaller rocky planets
Astronomical_object
Dwarf planet with a ring and two moons
recently thought to be sufficient for it to have relaxed into hydrostatic equilibrium, though that is now unclear. Haumea's elongated shape, together
Haumea
Continuous band of stars that appears on plots of stellar color versus brightness
star's collapse under gravity, maintaining the star in a state of hydrostatic equilibrium. The star's position on the main sequence is determined primarily
Main_sequence
Mechanical seal
hydrostatic seal is a non-contacting mechanical seal that operates under an equilibrium of forces. Unlike traditional hydrodynamic seals, hydrostatic
Hydrostatic_seal
Astronomical body that orbits a planet
under hydrostatic equilibrium, although this may not happen in the age of the Solar System. For example, the larger Saturnian moons are in equilibrium, while
Natural_satellite
Second-largest moon of Saturn
the smallest body in the Solar System that is confirmed to be in hydrostatic equilibrium. It has a nearly circular orbit around Saturn, but it is also tidally
Rhea_(moon)
Earth's Moon and Jupiter's Io. Several of the largest ones are in hydrostatic equilibrium and would therefore be considered dwarf planets or planets if they
List_of_natural_satellites
Fourth-largest asteroid
is close to hydrostatic equilibrium 65 Cybele – one of the largest main-belt asteroids, whose shape is also close to hydrostatic equilibrium Hygiea family
10_Hygiea
Naturally-pressurized water source
well-pipe would rise to a height corresponding to the point where hydrostatic equilibrium is reached. A well drilled into such an aquifer is called an artesian
Artesian_well
Natural satellites of the planet Neptune
form a rubble disc. Triton is massive enough to have achieved hydrostatic equilibrium and to retain a thin atmosphere capable of forming clouds and hazes
Moons_of_Neptune
mode Hydrostatic equilibrium, the state of a system in which compression due to gravity is balanced by a pressure gradient force Hyperbolic equilibrium point
List_of_types_of_equilibrium
Star in the constellation Scutum
line predicted by stellar evolutionary theory at least maintening hydrostatic equilibrium per the Hayashi limit and the Humphreys–Davidson limit (typically
Stephenson_2_DFK_1
code simulated stellar spectra assuming the atmosphere to be in hydrostatic equilibrium, plane parallel, with convection described by mixing-length theory
Model_photosphere
Astrophysical limit on radiation from stars
gravitational force acting inward. The state of balance is called hydrostatic equilibrium. When a star exceeds the Eddington luminosity, it will initiate
Eddington_luminosity
Dwarf planet in the scattered-disc
possibly from Charon). It may be sufficiently massive to be in hydrostatic equilibrium and therefore a dwarf planet. Gonggong's large mass makes retention
Gonggong_(dwarf_planet)
Large planetary embryo
mass, protoplanets will begin to assume a spherical shape due to hydrostatic equilibrium and become dwarf planets, those of which that subsequently succeed
Protoplanet
Moon of Uranus
closely observed objects in the Solar System that might be in hydrostatic equilibrium (spherical under its own gravity), and its total surface area is
Miranda_(moon)
Large self-illuminated object in space
core. In addition to hydrostatic equilibrium, the interior of a stable star will maintain an energy balance of thermal equilibrium. There is a radial temperature
Star
Device used for matching elevations
distances (sometimes, kilometers) is termed hydrostatic levelling, after the principles of hydrostatic equilibrium and levelling. Communicating vessels Stoddard
Water_level_(device)
Shape taken by a self-gravitating fluid body rotating at constant velocity
Jacobi ellipsoid is a triaxial (i.e. scalene) ellipsoid under hydrostatic equilibrium which arises when a self-gravitating, fluid body of uniform density
Jacobi_ellipsoid
Gravitational process studied in astronomy
newly forming stars. An interstellar cloud of gas will remain in hydrostatic equilibrium as long as the kinetic energy of the gas pressure is in balance
Star_formation
Star formation process
is named after James Jeans. For stability, the cloud must be in hydrostatic equilibrium, which in case of a spherical cloud translates to d p d r = − G
Jeans_instability
Layer of gases surrounding an astronomical body held by gravity
well-defined surface. Instead the atmosphere is maintained in hydrostatic equilibrium by intense pressure deep in the body. The dynamic weather on these
Atmosphere
Kuiper belt object
orbiting closely around Varuna. Assumptions that the body is in hydrostatic equilibrium (and thus a dwarf planet) result in a calculated density too low
20000_Varuna
Measure for the size of planets and other Solar System objects
not rotating. A rotating object that is massive enough to be in hydrostatic equilibrium will be close in shape to an ellipsoid, with the details depending
Mean_radius_(astronomy)
Largest dwarf planet
specifically, its own gravity should pull it into a shape defined by hydrostatic equilibrium. It must have cleared the neighborhood around its orbit. Pluto
Pluto
Look up potato radius, hydrostatic equilibrium, dwarf planets, or small Solar System body in Wiktionary, the free dictionary. The potato radius is the
Potato_radius
Star at the centre of the Solar System
Sun's core diminishes to the point where the Sun is no longer in hydrostatic equilibrium, its core will undergo a marked increase in density and temperature
Sun
Stellar core remnant
1930 by Edmund C. Stoner. This value was corrected by considering hydrostatic equilibrium for the density profile, and the presently known value of the limit
White_dwarf
Study of dynamics of the Earth
fluid is in hydrostatic equilibrium. Since, over long periods, rocks readily deform under pressure, the Earth is in hydrostatic equilibrium to a good approximation
Geodynamics
Branch of astrophysics
inflow speed everywhere. The isotropic version is also called Hydrostatic equilibrium equation where balancing pressure gradient with gravity; the isotropic
Stellar_dynamics
Structure of stars
{\displaystyle \lambda \ll T/|\nabla T|} . First is a statement of hydrostatic equilibrium: the outward force due to the pressure gradient within the star
Stellar_structure
Void between celestial bodies
S2CID 91378510. Boulares, Ahmed; Cox, Donald P. (December 1990), "Galactic hydrostatic equilibrium with magnetic tension and cosmic-ray diffusion", Astrophysical
Outer_space
Value in astrophysics
radius of a star for a given mass. When a star is fully within hydrostatic equilibrium—a condition where the inward force of gravity is matched by the
Hayashi_limit
Largest natural satellite of Pluto
or tidal distortion if Charon is sufficiently massive to be in hydrostatic equilibrium. Any deviation from a perfect sphere is too small to have been
Charon_(moon)
Apparent force in a rotating reference frame
the hydrostatic equilibrium. However, in the atmosphere, winds are associated with small deviations of pressure from the hydrostatic equilibrium. In the
Coriolis_force
Size-based definition of celestial objects
celestial objects, any celestial object massive enough to achieve hydrostatic equilibrium and assume an ellipsoid shape, but not enough to sustain core fusion
Planetary-mass_object
Natural satellite orbiting Earth
the Earth, and that it is now too cold for its shape to restore hydrostatic equilibrium at its current orbital distance. Today tidal crust deformation
Moon
Large plutino with moon
is an elongated object. Under the assumption that Achlys is in hydrostatic equilibrium (that is, its shape is controlled by its own gravity and rotation)
208996_Achlys
Distant body in the outer Solar System
largest non-planets (despite the name) that, like planets, are in hydrostatic equilibrium and thus can display planet-like geological activity, yet have
Sedna_(dwarf_planet)
Astronomic definition
that the body would on this timescale or shorter reach a state of hydrostatic equilibrium in its interior. They explain their reasoning by noting that this
Geophysical definition of planet
Geophysical_definition_of_planet
Physical process transitioning a system from a symmetric state to a more ordered state
gravitational and hydrostatic equilibrium. Jacobi and soon later Liouville, in 1834, discussed the fact that a tri-axial ellipsoid was an equilibrium solution
Symmetry_breaking
Long-term future of planet Earth
contribute to the net energy generation that is needed to maintain hydrostatic equilibrium of the Sun. At present, nearly half the hydrogen at the core has
Future_of_Earth
Lowest layer of Earth's atmosphere
level and decreases at high altitude because the atmosphere is in hydrostatic equilibrium, wherein the air pressure is equal to the weight of the air above
Troposphere
Attraction of masses and energy
gravitational attraction competes, with thermal and radiation pressure in hydrostatic equilibrium until the star's atomic fuel runs out. The next phase depends upon
Gravity
Force resulting from a difference in pressure across a surface
is in an equilibrium state (i.e. there are no net forces, and no acceleration), the system is referred to as being in hydrostatic equilibrium. In the case
Pressure-gradient_force
Object in the Solar System
free particles of hydrogen.) Except for the largest, which are in hydrostatic equilibrium, natural satellites (moons) differ from small Solar System bodies
Small_Solar_System_body
Orbital radius at which a satellite might break up due to gravitational force
or the primary it orbits are neglected. It is assumed to be in hydrostatic equilibrium. These assumptions, although unrealistic, greatly simplify calculations
Roche_limit
Astronomical object that is neither a planet nor a comet
called dwarf planets if their own gravity is sufficient to achieve hydrostatic equilibrium and form an ellipsoidal shape. All other minor planets and comets
Minor_planet
Hertzsprung–Russell diagram. These stars are characterized by being in hydrostatic equilibrium and undergoing nuclear fusion of hydrogen-1 in their core region
Glossary_of_astronomy
Minimum energy to remove a system from a gravitationally bound state
hydrostatic equilibrium to be maintained. As the gas in a star becomes more relativistic, the gravitational binding energy required for hydrostatic equilibrium
Gravitational_binding_energy
Dwarf planet in the asteroid belt
(1⁄6 of the Moon's). It is close to being in hydrostatic equilibrium, but some deviations from an equilibrium shape have yet to be explained. Modelling has
Ceres_(dwarf_planet)
Large trans-Neptunian object in the scattered disc
roughly 3×1020 kg. 2017 OF201 is likely large enough to achieve hydrostatic equilibrium, which would make it a possible dwarf planet. For reference, Pluto
2017_OF201
Second-largest moon of Jupiter
0042—determined during close flybys) suggest that, if Callisto is in hydrostatic equilibrium, its interior is composed of compressed rocks and ices, with the
Callisto_(moon)
Larger moon of Haumea
hydrostatic equilibrium because its elongated shape is inconsistent with that expected for its current rotation period. Hiʻiaka's lack of hydrostatic
Hiʻiaka_(moon)
Shape of a spinning body of self-gravitating fluid
considered to be the simplest model of rotating ellipsoidal figures in hydrostatic equilibrium since it assumes uniform density. For a spheroid with equatorial
Maclaurin_spheroid
Force distributed over an area
preventing the gas from diffusing into outer space and maintaining hydrostatic equilibrium. In a physical container, the pressure of the gas originates from
Pressure
Hypothetical early-universe star with a black hole core
would mark the end of the quasi-star's life since there is no hydrostatic equilibrium at or below this limiting temperature. It would then dissipate
Quasi-star
Contraction of an astronomical object due to the influence of its gravity
states of equilibrium. An interstellar cloud of gas will remain in hydrostatic equilibrium as long as the kinetic energy of the gas pressure is in balance
Gravitational_collapse
Fluid-filled space between the lungs
accumulate in the pleural space. The hydrostatic equilibrium model, viscous flow model and capillary equilibrium model are the three hypothesised models
Pleural_cavity
1000-km-order method of measuring weather systems
vertical coordinates, the momentum equation simplifies to the hydrostatic equilibrium equation. The word synoptic is derived from the Ancient Greek word
Synoptic_scale_meteorology
Nuclear fusion type found in older stars
to offset greater gravitational forces to stay in (approximate) hydrostatic equilibrium. That generally means higher temperatures, although lower densities
Carbon-burning_process
Planet containing a significant amount of water or other liquid
the body is in hydrostatic equilibrium (i.e. behaving like a fluid on long timescales). Proving that a body is in hydrostatic equilibrium is extremely difficult
Ocean_world
Third planet from the Sun
object with the highest density. Earth has a rounded shape, through hydrostatic equilibrium, with an equatorial diameter of 12,756 kilometers (7,926 mi), making
Earth
Luminosity–temperature relationship in stars
in hydrostatic equilibrium, even those that are partially or fully radiative. Newborn protostars start out in this zone, but are not in hydrostatic equilibrium
Hayashi_track
Changes to stars over their lifespans
generation. The onset of nuclear fusion leads relatively quickly to a hydrostatic equilibrium in which energy released by the core maintains a high gas pressure
Stellar_evolution
Pressure exerted by a vapor in thermodynamic equilibrium
Vapor pressure or equilibrium vapor pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid)
Vapor_pressure
Topics referred to by the same term
Heyd-Scuseria-Ernzerhof functional, in computational quantum mechanical modelling Hydrostatic equilibrium, in fluid mechanics Higher Speed Ethernet, in computer networking
HSE
Distance over which a quantity decreases by a factor of e
relative to the central object. We assume that the disc is in hydrostatic equilibrium with the z component of gravity from the star, where the gravity
Scale_height
Second largest main-belt asteroid
by the Dawn spacecraft has shown that Vesta is currently not in hydrostatic equilibrium. Temperatures on the surface have been estimated to lie between
4_Vesta
Resonant trans-Neptunian object
itself into a spherical or ellipsoidal shape, which would result in hydrostatic equilibrium. Since this is one of the requirements for becoming a dwarf planet
(84522)_2002_TC302
Large asteroid in the asteroid belt
indicate that the shape of Interamnia may be consistent with hydrostatic equilibrium for a body of its density with a rotational period of 7.6 hours
704_Interamnia
Dwarf planet in the Kuiper belt
known as a Maclaurin spheroid, which occurs when an object is in hydrostatic equilibrium (that is, the object's gravity is strong enough to compress it
Makemake
Stellar astrophysics stating that the structure of a star in hydrostatic and thermal equilibrium is determined solely by its total mass and chemical composition
Vogt–Russell_theorem
Subfield of astronomy
signals from terrestrial interference, refining SETI searches. Hydrostatic equilibrium – balance between inward gravitational force and outward pressure
Outline_of_astrophysics
Binary trans-Neptunian object
suggest that it is not in hydrostatic equilibrium—its shape is not rounded by its own gravity. Assuming hydrostatic equilibrium for Huya predicts a low
38628_Huya
Minor planet found within the inner Solar System
which is consistent both with it being in hydrostatic equilibrium, or formerly being in hydrostatic equilibrium, or with being disrupted and recoalescing
Asteroid
Maximum mass of a stable white dwarf star
Eddington's polytropes for his models which could, therefore, be in hydrostatic equilibrium, which constant density stars cannot, and real ones must be." This
Chandrasekhar_limit
Theorem about gravity
characterizes the surface gravity on a viscous rotating ellipsoid in hydrostatic equilibrium under the action of its gravitational field and centrifugal force
Clairaut's_theorem_(gravity)
Disproven hypothesis
observed thickness of the Earth's crust would not be able to achieve hydrostatic equilibrium with its own mass and would collapse.[citation needed] Drilling
Hollow_Earth
Large asteroid in the asteroid belt
re-accreted after being disrupted by a collision, and it is not close to hydrostatic equilibrium. Euphrosyne is a fairly dark body near the belt's outer edge. Consequently
31_Euphrosyne
Quantum mechanics principle
structure is disrupted by extreme pressure, but the stars are held in hydrostatic equilibrium by degeneracy pressure, also known as Fermi pressure. This exotic
Pauli_exclusion_principle
Phenomenon where interior material reaches the surface of an astronomical body
rigid open channel, in the lithosphere and settles at the level of hydrostatic equilibrium. Despite how it explains observations well (which newer models
Volcanism
Region at the center of a star
inward; a process that self-maintains the conditions in thermal and hydrostatic equilibrium. The minimum temperature required for stellar hydrogen fusion exceeds
Stellar_core
HYDROSTATIC EQUILIBRIUM
HYDROSTATIC EQUILIBRIUM
HYDROSTATIC EQUILIBRIUM
HYDROSTATIC EQUILIBRIUM
Male
Italian
Italian form of Roman Latin Fabricius, FABRIZIO means "craftsman."
Girl/Female
Indian, Punjabi, Sikh
Protector of Softness
Boy/Male
English Irish American
Broad hillside.
Male
Swedish
Short form of Swedish Gyrdher, GYRDH means "God's peace."
Boy/Male
Sikh
Victory of charm, Enticing victor
Girl/Female
Anglo Saxon
Princess.
Surname or Lastname
English
English : variant spelling of Doughty.
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : nickname denoting someone who behaved in a regal fashion or who had earned the title in some contest of skill or by presiding over festivities, from Old French rey, roy ‘king’. Occasionally this was used as a personal name.English : nickname for a timid person, from Middle English ray ‘female roe deer’ or northern Middle English ray ‘roebuck’.English : variant of Rye (1 and 2).English : habitational name, a variant spelling of Wray.Scottish : reduced and altered form of McRae.French : from a noun derivative of Old French raier ‘to gush, stream, or pour’, hence a topographic name for someone who lived near a spring or rushing stream, or a habitational name from a place called Ray.Indian : variant of Rai.
Male
Spanish
Spanish form of German Raginmund, RAMÓN means "wise protector."
Girl/Female
Tamil
A season, Lioness
HYDROSTATIC EQUILIBRIUM
HYDROSTATIC EQUILIBRIUM
HYDROSTATIC EQUILIBRIUM
HYDROSTATIC EQUILIBRIUM
HYDROSTATIC EQUILIBRIUM
a.
Of or pertaining to the motions of fluids, or the forces which produce or affect such motions; -- opposed to hydrostatic.
a.
Depending upon, or due to, deposition or setting; as, hypostatic cognestion, cognestion due to setting of blood by gravitation.
adv.
According to hydrostatics, or to hydrostatic principles.
adv.
In a hypostatic manner.
a.
Being, or being thrown, out of equilibrium; hence, disordered or deranged in sense; unsteady; unsound; as, an unbalanced mind.
a.
Alt. of Hydrostatical
n.
A form of balance in which the body to be weighed is suspended from the shorter arm of a lever, which turns on a fulcrum, and a counterpoise is caused to slide upon the longer arm to produce equilibrium, its place upon this arm (which is notched or graduated) indicating the weight; a Roman balance; -- very commonly used also in the plural form, steelyards.
n.
A contrivance or apparatus to prevent the explosion of steam boilers.
pl.
of Equilibrium
n.
One who is versed or skilled in hydrostatics.
prep.
The alternate rising and falling of the waters of the ocean, and of bays, rivers, etc., connected therewith. The tide ebbs and flows twice in each lunar day, or the space of a little more than twenty-four hours. It is occasioned by the attraction of the sun and moon (the influence of the latter being three times that of the former), acting unequally on the waters in different parts of the earth, thus disturbing their equilibrium. A high tide upon one side of the earth is accompanied by a high tide upon the opposite side. Hence, when the sun and moon are in conjunction or opposition, as at new moon and full moon, their action is such as to produce a greater than the usual tide, called the spring tide, as represented in the cut. When the moon is in the first or third quarter, the sun's attraction in part counteracts the effect of the moon's attraction, thus producing under the moon a smaller tide than usual, called the neap tide.
a.
Of or relating to hydrostatics; pertaining to, or in accordance with, the principles of the equilibrium of fluids.
n.
The branch of science which relates to the pressure and equilibrium of nonelastic fluids, as water, mercury, etc.; the principles of statics applied to water and other liquids.
a.
Alt. of Hypostatical
a.
Of or pertaining to the gyrostat or to gyrostatics.
n.
A level position; a just poise or balance in respect to an object, so that it remains firm; equipoise; as, to preserve the equilibrium of the body.
n.
The science or art of comparing or measuring degrees of moisture.
a.
The force by which a part is pulled when forming part of any system in equilibrium or in motion; as, the tension of a srting supporting a weight equals that weight.
n.
A limited reciprocating motion of a particle of an elastic body or medium in alternately opposite directions from its position of equilibrium, when that equilibrium has been disturbed, as when a stretched cord or other body produces musical notes, or particles of air transmit sounds to the ear. The path of the particle may be in a straight line, in a circular arc, or in any curve whatever.