4.0 TYPE OF FUELS.

                                    FUEL: a matter which can readily burn is called "FUEL".
TYPES OF FUEL
1) SOLID FUEL  :  WOOD, PAPER,COTTON .

             A) TINDER FUEL : occupy more then 20sqcm/gm.
             B) KINDLING F.  : occupy 2-20sqcm/gm.
             C) BULK  F.         : occupy 0.04-2sqcm/gm.

2) LIQUID FUEL :   PETROL, DIESEL, KEROSENE ETC..

             A) LIGHTER THEN WATER : which has density less then water(water density= 1000kg/m3)
                                                              e.g:  PETROL , DIESEL.

           B) HEAVIER THEN WATER: have density greater then water..                                                                                                                    e.g CARBON DI-DISULPHIDE.(CS2 = 1300KG/cube M).

           C) MISCIBLE IN WATER : which mix in water.. e.g  ALCOHOL.

3) GASEOUS FUEL : LPG, CNG, HYDROGEN..

           A) LIGHTER THEN AIR : which has vapor density less then air (air = 1.22521 kg/m³).
       
           B) HEAVIER THEN AIR :  which has vapor density greater then air.  e. g  LPG.