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Straight line segment that passes through the centre of a circle
the diameter of a sphere. In more modern usage, the length d of a diameter is also called the diameter. In this sense one speaks of the diameter rather
Diameter
Computer network protocol
Diameter is an authentication, authorization, and accounting (AAA) protocol for computer networks. It evolved from the earlier RADIUS protocol. It belongs
Diameter_(protocol)
How large a sphere or circle appears
The angular diameter, angular width, angular size, apparent diameter, or apparent size is an angular separation (in units of angle) describing how large
Angular_diameter
American precision-guided glide bomb
The GBU-39/B Small Diameter Bomb (SDB) is a 250-pound (110 kg) precision-guided glide bomb that is intended to allow aircraft to carry a greater number
GBU-39_Small_Diameter_Bomb
System of stars and interstellar matter
estimated distance, leading to an angular diameter (also called "metric diameter"). The isophotal diameter is introduced as a conventional way of measuring
Galaxy
Topics referred to by the same term
Look up diameter in Wiktionary, the free dictionary. A diameter is a line segment passing through the center of a circle or sphere with both its endpoints
Diameter_(disambiguation)
Measurement in molecular physics
Kinetic diameter is a measure applied to atoms and molecules that expresses the likelihood that a molecule in a gas will collide with another molecule
Kinetic_diameter
Measure of a channel flow efficiency
The hydraulic diameter, DH, is a commonly used term when handling flow in non-circular tubes and channels. Using this term, one can calculate many things
Hydraulic_diameter
Width of an electromagnetic beam
The beam diameter or beam width of an electromagnetic beam is the diameter along any specified line that is perpendicular to the beam axis and intersects
Beam_diameter
Largest distance between two points
the diameter of a set of points in a metric space is the largest distance between points in the set. As an important special case, the diameter of a
Diameter_of_a_set
Measurement tool
A diameter tape (D-tape) is a measuring tape used to estimate the diameter of a cylinder object, typically the stem of a tree or pipe. A diameter tape
Diameter_tape
Measure of an object's size along a specified direction
The Feret diameter or Feret's diameter is a measure of an object's size along a specified direction. In general, it can be defined as the distance between
Feret_diameter
The tactical diameter of a ship is the distance: travelled on sea surface during a turning circle test with maximum rudder angle by the center of gravity
Tactical_diameter
Concept in group theory
In the area of abstract algebra known as group theory, the diameter of a finite group is a measure of its complexity. Consider a finite group ( G , ∘ )
Diameter_(group_theory)
Number, approximately 3.14
equal to 3.14159, that is the ratio of a circle's circumference to its diameter. It appears in many formulae across mathematics and physics, and some of
Pi
Large self-illuminated object in space
star's angular diameter can be computed. Stars range in size from neutron stars, which vary anywhere from 20 to 40 km (25 mi) in diameter, to supergiants
Star
Internal diameter of the barrel of a firearm
of a firearm is a unit of measurement used to express the inner diameter (bore diameter) and other necessary parameters to define in general a smoothbore
Gauge_(firearms)
Average measure of particle size
In fluid dynamics, Sauter mean diameter (SMD) is an average measure of particle size. It was originally developed by German scientist Josef Sauter in the
Sauter_mean_diameter
Soft redirect to Wiktionary
"major diameter", but its sister project Wiktionary does: Read the Wiktionary entry "major diameter" You can also: Search for Major diameter in Wikipedia
Major_diameter
Average particle size weighted by volume
diameter is the mean of a particle size distribution weighted by the volume (also called volume-weighted mean diameter, volume moment mean diameter.
De_Brouckere_mean_diameter
The Martin diameter is the length of the area bisector of an irregular object in a specified direction of measurement. It is used to measure particle size
Martin_diameter
Median aerodynamic diameter (MAD) is one of two parameters influencing the deposition of inhaled particles, the other being the geometric standard deviation
Median_aerodynamic_diameter
Longest distance between two vertices
theory, the diameter of a connected undirected graph is the farthest distance between any two of its vertices. That is, it is the diameter of a set for
Diameter_(graph_theory)
In fiber optics, the mode field diameter (MFD) is a measure of the width of an irradiance distribution, i.e., the optical power per unit area, across the
Mode_field_diameter
Comparison of a wide range of lengths
20 km – diameter of Leda, one of Jupiter's moons 20 km – diameter of Pan, one of Saturn's moons 20 km – diameter of the Crab Pulsar. 22 km – diameter of Phobos
Orders_of_magnitude_(length)
Title of multiple roadside attractions
circumference is located in Cawker City, Kansas, measured at 8.06 feet (2.46 m) in diameter and 10.83 feet (3.30 m) in height.[needs update] In Cawker City, Kansas
Biggest_ball_of_twine
Perpendicular diameters of a circle or hyperbolic-orthogonal diameters of a hyperbola
geometry, two diameters of a conic section are said to be conjugate if each chord parallel to one diameter is bisected by the other diameter. For example
Conjugate_diameters
Diameter of a sphere of the same volume as an irregularly-shaped subject
The equivalent spherical diameter of an irregularly shaped object is the diameter of a sphere of equivalent geometric, optical, electrical, aerodynamic
Equivalent_spherical_diameter
Unit of length; one millionth of a metre
as sizes of biological cells and bacteria, and for grading wool by the diameter of the fibres. The width of a single human hair ranges from approximately
Micrometre
The half flux diameter or HFD is a definition used by astronomers to define the star size in an astronomical image. Mainly due to the seeing, stars are
Half_flux_diameter
Glide bomb
Ground Launched Small Diameter Bomb (GLSDB) is a weapon developed by Boeing and the Saab Group to allow Boeing's GBU-39 Small Diameter Bomb (SDB), originally
Ground Launched Small Diameter Bomb
Ground_Launched_Small_Diameter_Bomb
surrounding space. Most irregular moons are less than 10 kilometres (6.2 mi) in diameter. The earliest published discovery of a moon other than Earth's was by Galileo
List_of_natural_satellites
Chinese super-heavy rocket in development
recent 2023 proposal calls for a three-stage rocket with a 10.6 meter diameter. The reusable first stage would use a cluster of 30 YF-215 methalox engines
Long_March_9
Simple curve of Euclidean geometry
two points on the circle and passing through the centre is called the diameter. A circle bounds a region of the plane called a disc. The circle has been
Circle
Height of the abdomen measured in the supine position
Sagittal abdominal diameter (SAD) is a measure of visceral obesity, the amount of fat in the gut region. SAD is the distance from the small of the back
Sagittal_abdominal_diameter
Revolver cartridge
a rimmed, smokeless powder cartridge with a 0.357 in (9.07 mm) bullet diameter. It was created by Elmer Keith, Phillip B. Sharpe, and Douglas B. Wesson
.357_Magnum
Standard method of expressing the diameter of the trunk or bole of a standing tree
Diameter at breast height, or DBH, is a standard method of expressing the diameter of the trunk or bole of a standing tree. DBH is one of the most common
Diameter_at_breast_height
In forestry, quadratic mean diameter or QMD is a measure of central tendency which is considered more appropriate than arithmetic mean for characterizing
Quadratic_mean_diameter
Extremal graph problem with bounded degree and diameter
maximum degree at most d and diameter at most k? More unsolved problems in mathematics In graph theory, the degree–diameter problem asks for the maximum
Degree_diameter_problem
Computer security procedure
and Diameter. In some related but distinct contexts, the term AAA has been used to refer to protocol-specific information. For example, Diameter uses
Authentication, authorization, and accounting
Authentication,_authorization,_and_accounting
Tree connecting given points by short paths
geometry, a minimum-diameter spanning tree of a finite set of points in a metric space is a spanning tree in which the diameter (the longest path length
Minimum-diameter spanning tree
Minimum-diameter_spanning_tree
Distance from the Earth surface to a point near its center
of 10 m (33 ft). Earth's diameter is simply twice Earth's radius; for example, equatorial diameter (2a) and polar diameter (2b). For the WGS84 ellipsoid
Earth_radius
Speed gauge in motor vehicles
due to nonstandard tire diameter, in which case the error is: Percentage error = 100 × ( 1 − new diameter standard diameter ) {\displaystyle {\mbox{Percentage
Speedometer
Pistol cartridge
into medium-frame (9 mm size) semi-automatic handguns. It uses 0.40-inch-diameter (10 mm) bullets typically ranging in weight from 105 to 200 grains (6.8
.40_S&W
Specialized centrifuge device
The large diameter centrifuge, or LDC, is any centrifuge extending several meters, which can rotate samples to change their acceleration in space to enhance
Large_diameter_centrifuge
Rotating circular machine part with teeth that mesh with another toothed part
materials, and are used for many different functions and applications. Diameters may range from a few μm in micromachines, to a few mm in watches and toys
Gear
Hardware threading standard
outer diameter of the screw thread, in millimetres. This is also referred to as the "major" diameter in the information below. It indicates the diameter of
ISO_metric_screw_thread
Road in Russia
The Western High-Speed Diameter (ЗСД, ZSD, Russian: Западный скоростной диаметр, romanized: Zapadnyy skorostnoy diametr) is a toll motorway in Saint Petersburg
Western_High-Speed_Diameter
A subwavelength-diameter optical fibre (SDF or SDOF) is an optical fibre whose diameter is less than the wavelength of the light being propagated through
Subwavelength-diameter optical fibre
Subwavelength-diameter_optical_fibre
North American set of standard sizes for pipes
temperatures. "Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example, "2-inch-nominal
Nominal_Pipe_Size
Giant sequoia in Giant Forest, California
off. There were no witnesses to the incident, and the branch—with a diameter of over 2 m (6.6 ft) and a length of over 30 m (98 ft), larger than most
General_Sherman_Tree
compares the crater diameter with the diameter of the impacted celestial body. The maximum crater diameter is 157% of the body diameter (the circumference
List of largest craters in the Solar System
List_of_largest_craters_in_the_Solar_System
Radius of a circle or sphere equivalent to a non-circular or non-spherical object
volume of a non-circular or non-spherical object. The equivalent diameter (or mean diameter) ( D {\displaystyle D} ) is twice the equivalent radius. The perimeter
Equivalent_radius
Revolver cartridge
as .38 SC. The original .38 SC and .38 LC differ in case length, bullet diameter, weight, and design and are not interchangeable; however, modern production
.38_Long_Colt
.22 caliber rimfire cartridge used in rifles, pistols, revolvers, and submachine guns
bullet diameter is larger than the nominal bore diameter. Lead bullets with a diameter equal to or slightly smaller than the barrel's groove diameter may
.22_long_rifle
Suspension of fine solid particles or liquid droplets in a gas
particulate matter alone. The liquid or solid particles in an aerosol have diameters typically less than 10 μm. Larger particles, with a significant settling
Aerosol
Prehistoric impact crater in Mexico
kilometers (six miles) in diameter, struck Earth. The crater is estimated to be two hundred kilometers (120 mi) in diameter and is buried to a depth of
Chicxulub_crater
Largest verified impact structure on Earth
as the Vredefort Dome, which is around 100–120 kilometres (62–75 mi) in diameter. The impact structure was formed during the Paleoproterozoic Era, 2.023 billion
Vredefort_impact_structure
Microscopic solid or liquid matter suspended in the Earth's atmosphere
granularity, with a particle diameter of 10 micrometers (μm) or less; fine particles, designated PM2.5, with a diameter of 2.5 μm or less; ultrafine particles
Particulate_matter
Hunting cartridge by Winchester Repeating Arms
such as an overall cartridge length of 2.26 inches (57 mm) and a rim diameter of .378 inches (9.6 mm). At the 2019 SHOT Show in Las Vegas, Nevada, the
.350_Legend
Pistol cartridge designed by Evan Whildin
production. The actual cartridge has a .543-inch diameter (13.8 mm) base, with a rebated rim. The rim diameter of the .50 AE is the same as the .44 Remington
.50_Action_Express
Internal diameter of the barrel of a gun
calibre; sometimes abbreviated as "cal") is the specified nominal internal diameter of the gun barrel bore – regardless of how or where the bore is measured
Caliber
Farthest distance between two points
geometry, the diameter of a finite set of points or of a polygon is its diameter as a set, the largest distance between any two points. The diameter is always
Diameter (computational geometry)
Diameter_(computational_geometry)
American precision-guided glide bomb
The GBU-53/B StormBreaker, previously known as the Small Diameter Bomb II (SDB-II), is an American air-launched, precision-guided glide bomb. Development
GBU-53/B_StormBreaker
or pitch line; also, the radial distance between the pitch diameter and the outside diameter. Addendum angle in a bevel gear, is the angle between face
List_of_gear_nomenclature
Smoothbore/rifled shotgun caliber
shotgun. Twenty-gauge shotguns have a bore diameter of .615 in (15.6 mm), while a 12-gauge shotgun has a bore diameter of .729 in (18.5 mm). Twelve-gauge and
20-gauge_shotgun
Impact crater on the surface of the asteroid 4 Vesta
asteroid Vesta. It is 505 km (314 mi) in diameter, which is 90% the diameter of Vesta itself, and is 95% the mean diameter of Vesta, 529 km (329 mi). However
Rheasilvia
On triangles inscribed in a circle with a diameter as an edge
if A, B, and C are distinct points on a circle where the line AC is a diameter, the angle ∠ ABC is a right angle. Thales's theorem is a special case of
Thales's_theorem
Major astronomical facility in Chile
reflecting telescope with a 39.3-metre-diameter (130-foot) segmented primary mirror and a 4.25 m (14 ft) diameter secondary mirror. The telescope is equipped
Extremely_Large_Telescope
Centerfire rifle cartridge
aerodynamic efficiency and external ballistic performance for the projectile diameter. For some loads, the 6.5mm Creedmoor is capable of duplicating the muzzle
6.5mm_Creedmoor
Astronomical concept
In astronomy, angular diameter distance is a distance (in units of length) defined in terms of an object's physical size (also in units of length), x {\displaystyle
Angular_diameter_distance
Plane representing the boundary between the pelvic and abdominal cavities
follows: The diameters or conjugates of the pelvis are measured at the pelvic inlet and outlet and as oblique diameters. Two diameters may be measured
Pelvic_inlet
Rifle cartridge
Winchester uses a .270 inch (6.86 mm) bore diameter and a .277 inch (7.04 mm) bullet diameter. The bore diameter was likely inspired by 7mm Mauser. The physics
.270_Winchester
Revolver cartridge designed by Cor-bon and Smith & Wesson (S&W)
the bore diameter of 0.4880 in (12.40 mm) is consistent with other firearms which fire a 0.500 in (12.7 mm) diameter bullet, the groove diameter of 0.4983 in
.500_S&W_Magnum
Mechanical engineering term
A bolt circle diameter or pitch circle diameter (PCD), sometimes simply called bolt circle or pitch circle, is a common term for when a number of screw
Bolt_circle
American rifle cartridge
Special (.321 in) differs from the .30-30 Winchester (.308 in) in bullet diameter. More significantly, Winchester decreased the rate of rifling twist in
.32_Winchester_Special
Measure for the size of planets and other Solar System objects
and small Solar System bodies. Alternatively, the closely related mean diameter ( D {\displaystyle D} ), which is twice the mean radius, is also used.
Mean_radius_(astronomy)
Geologic basin on Mercury
Mariner 10. The plain is approximately 473 kilometers in diameter. A large volcanic dome 7 km in diameter and 1.4 km high is situated near the center of Odin
Odin_Planitia
Networking protocol for Diameter protocol
Diameter Credit-Control Application is a networking protocol for Diameter application used to implement real-time credit-control for a variety of end
Diameter Credit-Control Application
Diameter_Credit-Control_Application
theory, the degree diameter problem is the problem of finding the largest possible graph for a given maximum degree and diameter. The Moore bound sets
Table of the largest known graphs of a given diameter and maximal degree
Table_of_the_largest_known_graphs_of_a_given_diameter_and_maximal_degree
Part of an optical fiber that carries light
differentiated primarily by its diameter or cross-sectional area, each of which impacts various performance characteristics. The core's diameter should be uniform with
Core_(optical_fiber)
A kinetic diameter data structure is a kinetic data structure which maintains the diameter of a set of moving points. The diameter of a set of moving points
Kinetic_diameter_(data)
Pistol cartridge designed by John Moses Browning
to cartridge naming conventions, named after the diameter of the bullet, as the actual bullet diameter of the .380 ACP is .355 inches. The .380 ACP cartridge
.380_ACP
Size of an atom's imaginary sphere representing how close other atoms can get
gases by approximating the molecule as a rod with rounded ends where the diameter is 2rw and the internuclear distance is d. The algebra is more complicated
Van_der_Waals_radius
Rimmed, .30 caliber rifle cartridge
differences in case dimensions and bullet diameter. Despite its name, the .303 Savage uses a .308 in (7.8 mm) diameter bullet, while the .303 British uses a
.303_Savage
Revolver cartridge designed by the U.S. Army
the same rim diameter as the .45 colt and using a reduced powder charge, not to be confused with the .45 Schofield with a larger rim diameter, which was
.45_Colt
Blurry region in optics
context include maximum permissible circle of confusion, circle of confusion diameter limit, and the circle of confusion criterion. Real lenses do not focus
Circle_of_confusion
Screw thread profiles with trapezoidal outlines
(clearances) and tolerances on the major diameters of nut and bolt be less than the sum of the allowances on the pitch diameters (PD). The drawback is that for
Trapezoidal_thread_form
Minimum dimension for a vehicle to make a turn
(alternatively, turning diameter or turning circle) of a vehicle defines the minimum dimension (typically the radius or diameter) of available space required
Turning_radius
Rifle cartridge
cartridge was based on a Swiss design and was loaded with a 8.08 mm (0.318 in) diameter 14.6 g (225 gr) round-nose full metal jacket bullet that was cupronickel
Patrone_88
given is the inner diameter (also called inside diameter, or clear span). The thickness of the dome is not included. If the inner diameter of a dome is not
List_of_largest_domes
Form of solid precipitation
hailstones usually measure between 5 mm (0.2 in) and 15 cm (6 in) in diameter. The METAR reporting code for hail 5 mm (0.20 in) or greater is GR, while
Hail
Cartridge
ultimately led to its lack of popularity. The cartridge is named for the bore diameter of the barrel in which the cartridge is chambered rather than the usual
.218_Bee
Red supergiant star in the constellation Orion
was measured in 1920, and subsequent studies have reported an angular diameter (i.e., apparent size) ranging from 0.042 to 0.056 arcseconds; that range
Betelgeuse
Rifle cartridge
The .505 Gibbs has a unique bullet diameter of .505 in (12.8 mm) while most other .50 caliber bullets have diameters of .510 in (13.0 mm). Barnes Bullets
.505_Gibbs
Rifle cartridge
cartridge ever produced at the time. With 5mm (.204 in) bore barrels and diameter bullets being virtually unavailable at the time (the 5mm RFM was the last
.17_HMR
Pistol cartridge designed by John Moses Browning
(6.35mm Browning) was designed as a .25-inch diameter caliber due to .25 inches being the smallest diameter caliber that John Browning could possibly configure
.25_ACP
Allotropes of carbon with a cylindrical nanostructure
A carbon nanotube (CNT) is a tube made of carbon with a diameter in the nanometre range (nanoscale). They are one of the allotropes of carbon. Two broad
Carbon_nanotube
Collision of two astronomical objects
resulting crater's diameter, which is on average proportional to the diameter of the impactor. Asteroids with a 1 km (3,280 ft) diameter strike Earth every
Impact_event
Bullets that expand on impact with a solid object
projectiles designed to expand on impact. This causes the bullet to increase in diameter, to combat over-penetration and produce a larger wound, thus causing more
Expanding_bullet
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