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Gauge factor (G) or strain factor is the product of strain and the quotient of change in strain gauge
Strain gauge

A strain gauge is a device used to measure the Strain of an object. Invented by Edward E. Simmons and Arthur C. Ruge in 1938, the most common type of strain gauge consists of an Electrical insulation flexible backing which supports a metallic foil pattern....
 electrical resistance
Electrical resistance

The electrical resistance of an object is a measure of its opposition to the passage of a steady electrical current. An object of uniform cross section will have a resistance proportional to its length and inversely proportional to its cross-sectional area, and proportional to the resistivity of the material....
 and unstrained resistance of strain gauge. Gauge factor is dependent on the mechanical strain e of the strain gauge, the temperature
Temperature

In physics, temperature is a physical property of a Physical system that underlies the common notions of hot and cold; something that feels hotter generally has the greater temperature....
 of the strain gauge and the Wheatstone bridge
Wheatstone bridge

A Wheatstone bridge is a measuring instrument invented by Samuel Hunter Christie in 1833 and improved and popularized by Sir Charles Wheatstone in 1843....
.

The gauge factor, G, is given by:

Where






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Gauge factor (G) or strain factor is the product of strain and the quotient of change in strain gauge
Strain gauge

A strain gauge is a device used to measure the Strain of an object. Invented by Edward E. Simmons and Arthur C. Ruge in 1938, the most common type of strain gauge consists of an Electrical insulation flexible backing which supports a metallic foil pattern....
 electrical resistance
Electrical resistance

The electrical resistance of an object is a measure of its opposition to the passage of a steady electrical current. An object of uniform cross section will have a resistance proportional to its length and inversely proportional to its cross-sectional area, and proportional to the resistivity of the material....
 and unstrained resistance of strain gauge. Gauge factor is dependent on the mechanical strain e of the strain gauge, the temperature
Temperature

In physics, temperature is a physical property of a Physical system that underlies the common notions of hot and cold; something that feels hotter generally has the greater temperature....
 of the strain gauge and the Wheatstone bridge
Wheatstone bridge

A Wheatstone bridge is a measuring instrument invented by Samuel Hunter Christie in 1833 and improved and popularized by Sir Charles Wheatstone in 1843....
.

The gauge factor, G, is given by:

Where
  • e = strain
  • ?R = change in strain gauge resistance
  • R = unstrained resistance of strain gauge
  • a = temperature coefficient
    Temperature coefficient

    The temperature coefficient is the relative change of a physical property when the temperature is changed by 1 Kelvin.In the following formula, let R be the physical property to be measured and T be the temperature at which the property is measured....
  • ? = temperature change