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.
Heat is energy that is transferred from one body to another as the result of a difference in temperature.
Temperature is a measure of hotness or coldness expressed in terms of any of several arbitrary scales like Celsius and Fahrenheit.
Kelvin, Celsius or Fahrenheit
Heat is a measure of how many atoms there are in a substance multiplied by how much energy each atom possesses.
Temperature is related to how fast the atoms within a substance are moving. The ‘temperature’ of an object is like the water level – it determines the direction in which ‘heat’ will flow.
Ability to do work
Heat has the ability to do work.
Temperature can only be used to measure the degree of heat.