Revise GCSE Physics


Question: What measurement scales are used for Heat and Temperature?

Temperature is measured on the Celsius Scale in oC.

The Celsius Scale is said to be an arbitrary or chosen scale, because it does not use a 'real' zero, and therefore the scale uses negative values as well; 0oC does not mean no temperature!

This is called a 'Chosen' scale, because Celsius decided on the meaning of zero, rather than letting nature pick.

Heat is measured on the Joule Scale.

The Joule Scale is said to be an absolute scale because it uses a 'true' zero.

Zero Joules means literally No Energy.

Absolute scales allow sensible discussion of ratios.