Gauge ( or ) may refer to:

Measurement

Gauge (instrument) A gauge, in science and engineering, is a device used to make measurements or in order to display certain dimensional information. A wide variety of tools exist which serve such functions, ranging from simple pieces of material against which sizes ...

, any of a variety of measuring instruments * Gauge (firearms) * Wire gauge, a measure of the size of a wire ** American wire gauge, a common measure of nonferrous wire diameter, especially electrical **

Birmingham gauge The Birmingham gauge is a wire gauge system, and is also used to specify thickness or diameter of hypodermic needles and tube products. Terminology Birmingham gauge is also known as the Stubs Iron Wire Gauge or Birmingham Wire Gauge. It is not t ...

, a measure of ferrous wire and hypodermic needle diameter ** Jewelry wire gauge, the size of wire used in jewelry making * Sheet metal gauge, thickness of metal in sheet form * Film gauge, a physical property of film stock which defines its size * The size of objects used in stretching (body piercing), especially earrings * Gauge block, a metal or ceramic block of precisely known dimension, used in measuring *

Sight glass Visual perception is the ability to interpret the surrounding environment through photopic vision (daytime vision), color vision, scotopic vision (night vision), and mesopic vision (twilight vision), using light in the visible spectrum reflecte ...

, also known as a water gauge, for measuring liquid level heights in storage tanks and pressure vessels *

Boost gauge A boost gauge is a pressure gauge that indicates manifold air pressure or turbocharger or supercharger boost pressure in an internal combustion engine. They are commonly mounted on the dashboard, on the driver's side pillar, or in a radio slo ...

, a gauge used in conjunction with turbo-super-chargers * Pressure gauge or vacuum gauge, see pressure measurement * Gauge pressure, pressure above ambient pressure *

Stream gauge A stream gauge, streamgage or stream gauging station is a location used by hydrologists or environmental scientists to monitor and test terrestrial bodies of water. Hydrometric measurements of water level surface elevation ("stage") and/or volu ...

, for measuring height and discharge of a river or stream *

Air core gauge An air core gauge is a specific type of rotary actuator in an analog display gauge that allows an indicator to rotate a full 360 degrees. It is used in gauges and displays, most commonly automotive instrument clusters. A typical automotive app ...

, a type of rotary actuator often used in automotive instruments * Gauger, one who gauges or measures, typically dutiable commodities, such as wine, landed from ships at docks

Sizes

Railway practice

* Track gauge, the distance between the two rails forming a railway track *

Loading gauge A loading gauge is a diagram or physical structure that defines the maximum height and width dimensions in railway vehicles and their loads. Their purpose is to ensure that rail vehicles can pass safely through tunnels and under bridges, and ke ...

, the maximum width and height of vehicles (engines, loaded wagons, etc.). * Structure gauge, the minimum size of bridges, tunnels, platforms, etc. * Axle load, the weight that an axle exerts on track * Variable gauge, system to allow railway vehicles to travel across a break of gauge

Medicine

, for metal wire and tube products *

French gauge The French scale, French gauge or Charrière system is commonly used to measure the size of a catheter. It is most often abbreviated as Fr, but can often be seen abbreviated as Fg, FR or F. It may also be abbreviated as CH or Ch (for Charrière, i ...

, mainly for catheters

Mathematics and physics

Gauge theory In physics, a gauge theory is a type of field theory in which the Lagrangian (and hence the dynamics of the system itself) does not change (is invariant) under local transformations according to certain smooth families of operations (Lie groups) ...

Gauge integral Gauge ( or ) may refer to: Measurement * Gauge (instrument), any of a variety of measuring instruments * Gauge (firearms) * Wire gauge, a measure of the size of a wire ** American wire gauge, a common measure of nonferrous wire diameter, es ...

* Gauge fixing *

Gauge boson In particle physics, a gauge boson is a bosonic elementary particle that acts as the force carrier for elementary fermions. Elementary particles, whose interactions are described by a gauge theory, interact with each other by the exchange of gauge ...

* Gauge (

Minkowski functional In mathematics, in the field of functional analysis, a Minkowski functional (after Hermann Minkowski) or gauge function is a function that recovers a notion of distance on a linear space. If K is a subset of a real or complex vector space X, then ...

)

Other uses

Gauge (knitting) In knitting, the word gauge is used both in hand knitting and machine knitting; the latter, technical abbreviation GG, refers to knitting machines fineness size. In both cases the term refers to the number of stitches per inch, not the size of the ...

, the number of stitches in a given length *

Gauge (actress) __NOTOC__ Gauge is an American pornographic actress and feature dancer. Career After having appeared in about 140 movies, Gauge left the pornographic film industry in 2005 due to a contract dispute with her management company. She was certified a ...

, American pornographic actress *

Gauge (band) Gauge is an American post-hardcore band from the northwest suburbs of Chicago, Illinois. History From the ashes of the bands Ivy League and Target, Gauge formed at the beginning of 1991. Highly regarded in Chicago's northwest suburban punk scene ...

, post-hardcore band from Chicago, Illinois, USA *

Gauge, Inc. Gauge Precision Instruments (originally Gauge, Inc.) is a U.S.-based designer and importer of audio electronics and accessories for professional and consumer markets. The company was founded by Chandler R. Bridges, Jr. and Robert C. Chiarelli in ...

, a manufacturer of microphones and audio accessories * Change of gauge (aviation), when an aircraft type changes at a stopping point of a direct flight *

Gauge (software) Gauge is a light weight cross-platform test automation tool. It uses markdown to author test cases and scenarios. Its modular architecture makes it flexible and scalable. Markdown Gauge specifications are written in the business language. For exa ...