Question

Why some material burn with flame while some others not?

Answer 1

Heya

Your answer is given below :

_______________________________
_______________________________

=> a flame is defined as a reason where combustion of gaseous substances takes place.hence, if flame is produced when gaseous substances Burn all the gaseous fuels burns with a flame all the solid and liquid fuels will burn with flame when the substances fuels vaporisers on heating for example, cooking gas LPG burns with a flame a wax candle burns with a flame because on heating
Vapourise.

the colour of the flame of the fuels maybe Yellow or blue then the fuels are burnt completely in excess of air or sufficient supply of air. blue coloured flame is produced. this will not give much light and is known as non luminous flame.LPG should burn with flame blue flame if all the pores of cooking gas stove are well cleaned.

When the fuels are burnt in completely in the Limited supply of air, yellow coloured flame is produced the yellow colour of the flame is due to the glow of heat unburnt carbon.this produces a large amount of heat light and hence it is called Luminous flame.

during the burning of wax is in candle wax is first vaporized, which produces a flame during this incomplete combustion of wax a small amount of unburnt carbon particles are produced.these solid unburnt carbon particles glow in yellowish light. the environment carbon particles have the candle flame as soot and smoke.

solid and liquid fuels which do not vaporize on heating burnt without flame.for example, coal, charcoal contains some volatile substances so on heating first these volatile substances get burnt with flame in the beginning when all the volatile substances get burnt, no flame is produced and hot coal charcoal produce heat without any flame.

_______________________________
_______________________________

Thanks