Science
easyQ. No. 15108-what-is-the-si-unit-of-heat
What is the SI unit of heat?
Last Updated:
ACalorie
BJoule
CBTU
DKelvin
Correct Answer: JouleYour Answer: B
Explanation
The SI (International System of Units) unit of heat is the Joule (J), named after physicist James Prescott Joule. Option A (Calorie) is incorrect — calorie is the CGS unit of heat, not the SI unit. 1 calorie = 4.186 joules. Option B (Joule) is CORRECT — it is the internationally accepted SI unit for measuring heat energy. Option C (BTU) is incorrect — BTU stands for British Thermal Unit, used mainly in engineering and is not an SI unit. 1 BTU = 252 calories. Option D (Kelvin) is incorrect — Kelvin is the SI unit of temperature, not heat. Heat and temperature are different physical quantities. Heat is a form of energy (measured in joules), while temperature is a measure of hotness (measured in Kelvin or Celsius).
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What is heat in physics?
Heat is a form of energy that transfers between objects or systems due to a temperature difference, moving from a hotter body to a cooler one until thermal equilibrium is reached.