Question

write definasion on 1] combustion , 2] fuel, 3] ignition temperature , 4] inflammable subtances

Answer 1

Answer:

1. A chemical process in which a substance born in the presence of oxygen to give of heat and light is called combustion

2. the materials that are born to produce a large amount of heat energy are called fuels

3. the lowest temperature to which a substance must be heated to catch fire and start burning is called its ignition temperature

4. the substance that have very low ignition temperature and catch fire easily with a flame are called inflammable substances

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Answer 2

■Combustion>>Combustion is the scientific word for burning. In a combustion reaction a substance reacts with oxygen from the air and transfers energy to the surroundings as light and heat. The products of a combustion reaction are called oxides.

■Fuel>>combustible matter used to maintain fire, as coal, wood, oil, or gas, in order to create heat or power. something that gives nourishment; food. an energy source for engines, power plants, or reactors: Kerosene is used as jet engine fuel.

■ignition temperature >>The autoignition temperature or kindling point of a substance is the lowest temperature in which it spontaneously ignites in a normal atmosphere without an external source of ignition, such as a flame or spark. ... The ignition temperature of a substance is the least temperature at which the substance starts combustion.

■inflammable substance>>substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. Examples of inflammable substances are petrol, alcohol, Liquefied Petroleum Gas (LPG), etc

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