At airports and petrol pumps hydrocarbon fire extinguishers are used, not the soda-acid fire extinguisher. Why ?
At airports or petrol pumps the probability of breaking fire from oils are more. In case of fires due to oils, soda-acid fire extinguisher is not successful, because it uses water to cool the combustible substance. But water is lighter than oil and settles down the oil particles and fire cannot be controlled. In such case Hydrocarbon fire extinguisher is used which has turkey red oil, which causes the foaming of carbon dioxide under pressure. The foam covers the surface of burning substance and cuts off the supply of air to control fire.
Which of the following has the lowest ignition temperature ?
petrol
kerosene
coal
LPG
Burning of fossil fuels causes pollution. Comment.
Coal burns with
flame
only glow
both flame and glow
none of the above
The substances which have very low ignition temperature will
catch fire easily
will not catch fire
catch fire after some time
none of the above