Why isn't temperature measured in Joules?

Answer 1

The temperature of an object does not depend on its energy, it is a property of the state of the object on a scale such as Centigrade (Celsius), where end points are defined in terms of the properties of water (freezing and boiling). The energy content of the object which is measured in calories or Joules (they are convertible) depends on its mass and the specific heat capacity of what it is made of, as well as the temperature it is at, so even if you could easily measure its energy content this would not tell you the temperature without knowing these other factors as well.

Answer 2

Temperature is a measure of the average kinetic energy of molecules in a substance, while energy is the capacity to do work or transfer heat. Temperature is measured in units like degrees Celsius or Fahrenheit, while energy is typically measured in Joules. The two concepts are related, but they measure different aspects of a system.