Question

21. Give one word for following:
a) Amount of heat energy produced on completely burning one kilogram of a fuel in pure
Oxygen
b) The minimum temperature at which a given substance begins to burn.
c) A region of burning gases.​

Answer 1

Answer:

Explanation:(b) one kilogram of the fuel is completely burnt. The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value. The calorific value of a fuel is expressed in kilojoule per kg (kJ/kg).

Answer 2

Ans1.The amount of heat liberated, when one kg of a fuel is completely burnt in sufficient supply of oxygen, is called the calorific value of the fuel.

Ans2.In 100°Celsius or 32°Fahrenheit or 373K is the starting temperature at which a substance burns.Flame: A region of burning gases is called flame.. A substance will burn with a flame, only if some gaseous substance is there to burn.

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Ans3.