Question

please answer the. following questions .............​

Answer 1

Answer:

2. Fuels can be classified into 3 types- solid,liquid and gaseous fuels.

3.We can say Rock,Glass,Most of metals are classified into incombustible substances.

Answer 2

Answer:

Ans1. Coal is burned and produces a high amount of heat but when candle is burnt it produces large amount of heat. Coal burning is harmful for environment when candle is burned it is not harmful for environment as coal.

Ans2. Fuels are classify as their physical properties. It can be classified as:

1. Liquid
2. Solids
3. Gaseous fuels