What is the difference between fuel and combustible substance class 8?

A substance which burns in air and tends to produce heat and light is known as Combustible substances. Non-combustible substances are certain substances which are not combustible in the presence of air. Will not burn on being exposed to flame. Examples – Diesel, petrol, kerosene.

Are all combustible substances are fuel?

All combustible substances are not fuels. Fuel is a substance which on burning releases a large amount of energy as heat at a reasonable cost and leaves behind little ash content.

Why is fuel a combustible substance?

Fuel is a combustible substance, containing carbon as a main constituent, which on proper burning gives large amount of heat, which can be used economically for domestic and industrial purpose. ‘Any compound or a substance which can produce energy and can be use in the production of power is termed as a fuel.

What is difference between a combustible and a non-combustible substance?

Substance that burn in air and tend to produce heat and light are known as combustible substances. For combustion it is necessary to have fuel, heat and air. On the other hand, non-combustible substances are the substances that do not undergo combustion in the presence of air. For example, stone, glass, iron nails etc.

Which is a combustible substance?

Those substances which can burn are called combustible substances. For Example: Cloth, straw, cooking gas, kerosene oil, coal, charcoal, wood, leaves, paper, wax, hydrogen gas, ethanol, methane, propane, propene. Flammable materials are combustible materials that ignite easily at ambient temperatures.

What is combustible and non-combustible substances Class 8?

Combustible substances are those which readily burn in the presence of air or oxygen to produce heat and light. Non-combustible substances are those which do not readily burn in the presence of air or oxygen to produce heat and light.

Can we consider all combustible materials as fuels Why or why not?

Q2. (a) combustible and non combustible fuel. (b) efficient and non efficient fuel. (c) solid, liquid and gas.

Can fossil fuels be made in laboratory?

The fossil fuels are coal, petroleum and natural gas. They can’t be made in laboratory as it takes millions of years for these fuels to form gradually from buried and decaying organic material. Also, fossil fuels need high pressure and high temperature to form which cannot be produced in a laboratory.

Which of the following is combustible substance?

Which one of the following is a combustible substance? Explanation: Glass, iron nail and stone piece will not burn like wood hence they are not combustible. Wood burns in air and it is called the combustible substance.

What is meant by combustible substance?

Combustible material means a material that, in the form in which it is used and under the conditions anticipated, will ignite, burn, support combustion or release flammable vapors when subjected to fire or heat. Wood, paper, rubber, and plastics are examples of combustible materials.

What is the example of combustible?