The fuel with highest calorific value in kJ/kg unit is

Question

Accepted Answer

The correct answer to the question regarding the fuel with the highest calorific value in kJ/kg is Option 4: Hydrogen. Here is a detailed explanation supporting this choice:

1. **Hydrogen (Option 4):** Hydrogen is known for having the highest calorific value among common fuels. Its calorific value is approximately 120,000 kJ/kg. This high energy content is due to the fact that hydrogen, when burned, releases a significant amount of energy per unit mass. The combustion of hydrogen results in water as a byproduct, making it a clean fuel with a high energy yield. This makes hydrogen an excellent candidate for applications requiring high energy density.

2. **CNG (Option 1):** Compressed Natural Gas (CNG) primarily consists of methane and has a calorific value of about 50,000 kJ/kg. While CNG is a cleaner alternative to other fossil fuels and has a relatively high energy content, it does not surpass hydrogen in terms of calorific value.

3. **LPG (Option 2):** Liquefied Petroleum Gas (LPG) is a mixture of propane and butane, with a calorific value of approximately 46,000 kJ/kg. Although LPG is widely used for heating and cooking due to its convenience and efficiency, its calorific value is significantly lower than that of hydrogen.

4. **Petrol (Option 3):** Petrol, or gasoline, has a calorific value of around 47,000 kJ/kg. It is a common fuel for internal combustion engines, but like LPG and CNG, its energy content per kilogram is much lower than that of hydrogen.

In conclusion, hydrogen stands out as the fuel with the highest calorific value among the options provided. Its ability to release a large amount of energy per unit mass makes it the correct answer to the question.