Science Give the definition [1 M]

The substances, which have very low ignition temperature and can easily catch fire with a flame are called Inflammable substances.

The lowest temperature at which a substance catches fire is called its ignition temperature.

The fuel, which fulfils all the requirement for a particular use is called an ideal fuel.

It is the rise in temperature of the atmosphere of the earth due to the combustion of fuels.

A fuel is a substance, which may be burnt to produce considerable heat without the formation of undesirable products.

Fire extinguisher is used to control the fire. The job of a fire extinguisher is to cut off the supply of air or to bring down the temperature of the fuel, or both.

The process of combustion in which a large number of gases are evolved with the production of a tremendous amount of heat, light and sound, is called an explosion.

It is the process of cutting of trees on a large scale.

A chemical process in which a substance reacts with oxygen to give off heat is called combustion.

When the pollutants like sulphur dioxide and nitrogen oxides dissolve in rainwater, it forms an acid. The rain of that acid is called acid rain.

A flame has three zones, the outermost thin transparent faint bluish non-luminous region of complete combustion, the middle bright luminous zone of partial combustion, while the innermost is the coldest dark zone, which consists of hot vapours.

The fuel, which fulfils all the requirements for a particular use is called an ideal fuel.

It is the outer zone of flame, that is faintly blue in colour and undergoes complete combustion of the substance.

The middle zone of partial combustion that is yellow in colour and produces light, is called the luminous zone of flame.

It contains vapours of fuel and unburnt carbon particles.

The process of combustion in which a large number of gases are evolved with the production of a tremendous amount of heat, light and sound is called an explosion.

A combustion in which a material suddenly bursts into flames, without the application of any apparent cause is called spontaneous combustion.

A combustion, that takes place rapidly/high speed, with the production of heat and light is called rapid combustion.

The substances which burn in the air are called combustible.