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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What is the SI Unit of Heat FAQ's

  • The SI unit for heat is also known as joules (J), and it is defined as the quantity of energy needed to raise a given mass's temperature by one degree. Given that heat is a kind of energy, this is important.

  • British Thermal Unit or BHU, Calorie, and Joule are the other common units of Heat.

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