Flame & combustion

A PPT BY AJIT

WHAT IS COMBUSTION ?

•COMBUSTION: A CHEMICAL PROCESS IN WHICH A SUBSTANCE REACTS WITH OXYGEN TO GIVE OFF HEAT IS CALLED COMBUSTION

DIFFERENT TYPES OF COMBUSTIONS

•RAPID COMBUSTION : WE FIND THAT THE GAS BURNS RAPIDLY AND PRODUCES HEAT AND LIGHT. SUCH COMBUSTION IS CALLED RAPID COMBUSTION

•SPONTANEOUS COMBUSTION: A TYPE OF COMBUSTION IN WHICH A MATERIAL SUDDENLY BURSTS INTO FLAME IS CALLED SPONTANEOUS COMBUSTION

WHAT IS FLAME ?

FLAME: A FLAME IS A VISIBLE ,GASEOUS PART OF A FIRE IT IS CAUSED BY A HIGHLY EXOTHERMIC REACTION TAKING PLACE IN A THIN SOME

WHAT IS EXPLOSIN ?

EXPLOSION: A LARGE AMOUNT OF GAS FORMED IN THE REACTION IS LIBERATED .SUCH A REACTION IS CALLED EXPLOSION.

IGNITION TEMPERATURE, INFLAMMABLE SUBSTANCE…..•IGNITION TEMPERATURE: THE LOWEST TEMPERATURE

AT WHICH A SUBSTANCE CATCHES FIRE IS CALLED ITS IGNITION TEMPERATURE .

•INFLAMMABLE SUBSTANCE: THE SUBSTANCES WHICH HAVE A VERY LOW IGNITION TEMPERATURE AND CAN CATCH FIRE EASILY IS A CALLED INFLAMMABLE TEMPERATURE

DISADVANTAGES OF BURNING FUELS•1:CARBON FUELS LIKE WOOD ,COAL ,PETROLEUM RELEASE UNBURNT CARBON PARTICLES. THIS PARTICLES ARE DANGEROUS FOR RESPIRATION AND CAN CAUSE DISEASE LIKE ASTHMA.

•INCOMPLETE COMBUSTION OF THESE FUELS GIVES CARBON MONOXIDE GAS IT IS DANGEROUS TO BURN COAL IN A CLOSED ROOM .THIS CAN EVEN KILL THE PERSON SLEEPING IN THAT ROOM

•COMBUSTION OF MOST FUELS RELEASES CARBON DIOXIDE IN THE ENVIRONMENT ,INCREASE OF CARBON DIOXIDE IN THE AIR CAUSE GLOBAL .

•BURNING OF COAL AND DIESEL RELEASES SULPHUR DIOXIDE GAS .IT IS AN EXTREMELY SUFFOCATION AND CORROSIVE GAS. PETROL ENGINES GIVES OFF GASEOUS OXIDES OF NITROGEN .OXIDE OF SULPHUR AND NITROGEN DISSOLVES IN RAIN WATER AND FROM ACIDS SUCH RAIN IS CALLED ACID RAIN.IT IS VERY HARMFULL FOR PLANTS.

• THANK YOU• • A PPT BY

AJIT