From Diffen
| Heat | Temperature | ||
|---|---|---|---|
| Symbol: | Q | T | |
| Unit: | Joules | Kelvin, Celsius or Fahrenheit |
Heat and temperature are related and often confused. More heat usually means a higher temperature.
Heat (symbol: Q) is energy. It is the total amount of energy (both kinetic and potential) possessed by the molecules in a piece of matter. Heat is measured in Joules.
Temperature (symbol: T) is not energy. It relates to the average (kinetic) energy of microscopic motions of a single particle in the system per degree of freedom. It is measured in Kelvin (K), Celsius (C) or Fahrenheit (F).
When you heat a substance, either of two things can happen: the temperature of the substance can rise or the state of substance can change.
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