The calorific value of a fuel is expressed in a unit called

Options

A. kilojoule per litre
B. kilogram per mililitre
C. kilojoule per gram
D. kilojoule per kilogram

Answer

To answer the question "The calorific value of a fuel is expressed in a unit called," we can follow these steps:

### Step-by-Step Solution:

1. **Understand Calorific Value**:
- Calorific value refers to the amount of energy produced when a fuel is completely burned (combusted). It is an important measure in determining the efficiency of a fuel.

2. **Identify the Measurement of Heat**:
- The heat produced during the combustion of fuel is measured in joules or kilojoules. This indicates how much energy is released.

3. **Determine the Unit of Calorific Value**:
- Since calorific value is related to the amount of energy released per unit mass of the fuel, it is expressed as energy per unit weight.

4. **Express the Calorific Value**:
- The calorific value is typically expressed in kilojoules per kilogram (kJ/kg). This means that for every kilogram of fuel burned, a certain number of kilojoules of energy is released.

5. **Final Answer**:
- Therefore, the calorific value of a fuel is expressed in the unit of kilojoules per kilogram (kJ/kg).