# What is the SI Unit of Heat?

By Harshal Vispute|Updated : June 29th, 2022

In the SI system, joules are often used to measure all types of energy. Because heat is a type of energy, the SI unit for heat is also joules (J), which is defined as the amount of energy required to increase the temperature of a given mass by one degree. This is significant because heat is a form of energy.

In the SI system, joules are often used to measure all types of energy. Because heat is a type of energy, the SI unit for heat is also joules (J), which is defined as the quantity of energy required to increase the temperature of a given mass by one degree. This is significant because heat is a form of energy. Unit weight of water (let's say 1 g) typically requires 4.184 joules of heat energy to reach a temperature of 1 degree Celsius.

### SI Unit of Heat: Important Points

Other common units for the heat are given below:

• BHU: British thermal units, or BTUs. It is the amount of energy needed to raise a pound of water's temperature by 10 degrees Fahrenheit at sea level.
1 BTU = 1055.06 J = 2.931 x 10-4 kWh = 0.252 kcal = 778.16 ft lbf = 1.055 x 1010 ergs = 252 cal = 0.293 watt-hours.
• Calorie: the amount of energy needed to heat one gram of water by 10 degrees Celsius.
1 kcal = 4186.8 J = 426.9 kp m = 1.163 x 10-3 kWh = 3.088 ft lbf = 3.9683 BTU = 1000 cal
• Joule: The SI unit for heat is the joule.
1 J = 0.1020 kpm = 2.778 x 10-7 kcal = 0.7376 ft lb = 1 kg m2 / s2 = 1 watt second = 1 Nm = 9.478 x 10-4 BTU

## What is the SI unit of Heat?

The Joule is the SI unit for heat. The term "joule" refers to the amount of energy needed to raise the temperature of a particular body (mass) by a unit, or by one degree. To increase the temperature of a unit weight of water by a unit degree, 4.184 joules of energy (heat) are needed. The definition of heat is the movement of energy from a body having a higher temperature to a body with a lower temperature.

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