Give the calorific values of below fuels:
Petrol,

Answer

### Step-by-Step Solution:

1. **Understanding Calorific Value**:
- The calorific value of a fuel is the amount of heat energy produced when a specific quantity of the fuel is completely burned in the presence of oxygen.

2. **Complete Combustion**:
- When 1 kg of fuel is completely combusted in the presence of oxygen, it releases a certain amount of heat energy. This energy is what we measure as the calorific value.

3. **SI Unit of Calorific Value**:
- The SI unit for measuring calorific value is Joules per kilogram (J/kg).

4. **Calorific Value of Petrol**:
- The calorific value of petrol is approximately 45,000,000 Joules per kilogram (or 45,000 x 10^3 J/kg).

5. **Final Answer**:
- Therefore, the calorific value of petrol is 45,000 kJ/kg (or 45,000,000 J/kg).