Color Value of Different Fuels:

Cow Dung Cake:
- Cow dung cake is commonly used as a fuel in rural areas for cooking and heating purposes.
- It has a low color value as it produces a small flame and low heat output compared to other fuels.

Petrol:
- Petrol has a higher color value compared to cow dung cake as it produces a blue flame when burned.
- It is a commonly used fuel for vehicles and small engines due to its high energy content.

Kerosene:
- Kerosene has a slightly lower color value compared to petrol, producing a yellow flame when burned.
- It is often used for lighting and heating purposes in areas where electricity is not readily available.

Diesel:
- Diesel has a similar color value to kerosene, producing a yellow flame when burned.
- It is commonly used as a fuel for trucks, buses, and generators due to its high energy density.

CNG (Compressed Natural Gas):
- CNG has a higher color value compared to diesel, producing a blue flame when burned.
- It is a cleaner-burning fuel compared to diesel and is commonly used in vehicles and for heating purposes.

LPG (Liquefied Petroleum Gas):
- LPG has a higher color value compared to CNG, producing a blue flame when burned.
- It is a versatile fuel used for cooking, heating, and powering vehicles in many households.

Biogas:
- Biogas has a color value similar to LPG, producing a blue flame when burned.
- It is a renewable fuel produced from organic waste and is commonly used for cooking and heating purposes.

Hydrogen:
- Hydrogen has the highest color value among all the fuels mentioned, producing a colorless flame when burned.
- It is a clean and efficient fuel that is used in various industries and transportation systems.