What is the unit of heat?

Correct option is B

The correct answer is option (b) Joule.

Explanation

The unit of heat is the Joule (J), which is the standard SI unit of energy. Heat is a form of energy transfer, and the amount of heat transferred is measured in joules. One joule is defined as the amount of energy transferred when one newton of force moves an object one meter.

In thermodynamics, the joule is commonly used to quantify heat energy, as it is part of the standard unit system used to measure all forms of energy, including heat.

Information Booster

• 1 Joule (J) is equivalent to 1 kg·m²/s², which is the energy required to move a mass of 1 kilogram over a distance of 1 meter with a force of 1 newton.

• The unit Joule is used for all types of energy, including thermal energy (heat), mechanical energy, and electrical energy.

• Specific heat is typically expressed in Joules per kilogram per degree Celsius (J/kg°C) when describing the heat required to change the temperature of a substance.

• Calorie, another unit of heat, is sometimes used in specific contexts, but the SI unit remains the Joule.

Additional Knowledge

• Option (a) Dyne: A dyne is a unit of force in the CGS (centimeter-gram-second) system, not a unit of energy or heat. It is not used to measure heat.

• Option (b) Joule: This is the correct unit of heat. The joule is the standard SI unit for energy, and heat is measured in joules.

• Option (c) Joule/second: This unit represents power, not heat. Power is the rate of energy transfer, and the unit of power is the watt (W), where 1 watt = 1 joule/second.

• Option (d) Joule-second: This unit represents action (energy × time) and is not used to measure heat. The unit of heat is simply joule.