Physics XI Notes for Physics Notes

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Scales Of Temperature

There are three main scales of temperature:

  1. Centigrade or Celsius Scale
  2. Kelvin Scale
  3. Fahrenheit Scale


Caloric theory
Up to nineteenth century it was believed a weightless fluid called caloric which existed in every material body. Caloric is a hypothetical weightless fluid. Every object contains a specific amount of caloric. Hot bodies contains more caloric than the cold bodies.
If caloric is added to a body, its temperature increases. When a body is broken, a large amount of caloric is released.

Failure of caloric theory
Caloric Theory has discarded now because it was unable to explain a number of thermodynamics process including production of heat by friction.

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