Question

Which among the following is not the unit of heat capacity?
1. Joule / kg / Kelvin
2. Joule / Kelvin
3. Calorie / °C
4. killoJoule / °C

Answer 1

Correct Answer - Option 1 : Joule / kg / Kelvin

Concept:

Heat capacity:

• The amount of heat energy required to raise the temperature of the substance by 1 °C or 1 Kelvin is called the heat capacity. 
• The SI unit of heat capacity is Joule / Kelvin. 
• Here Joule is the SI unit of energy and Kelvin is the SI unit of temperature. 

Specific heat capacity:

• The amount of heat energy required to raise the temperature of 1kg of substance by 1 °C or 1 Kelvin is called the heat capacity. 
• The SI unit of heat capacity is Joule / Kg / Kelvin. 

Explanation:

• Joule / kg / Kelvin is the SI unit of specific heat capacity and not the heat capacity. So, it is the correct option here. 
• Joule / Kelvin is the unit of heat capacity. It the energy require (Joule) by temperature change taking place whose unit is kelvin. 
• So, unit of heat capacity will be (Unit of energy) / (unit of temperature). 
• Calorie / °C is also the ratio of unit of energy (Calorie) and temperature (°C). So, it is the unit of heat capacity. 
• killoJoule / °C is unit of heat capacity. KilloJoule is unit of heat energy and ° C is unit of temperature change.