coal and petroleum

urmom

combustion definition

when a substance burns in the presence of oxygen to produce heat

combustible substance

undergoes combution

e.g wood, wax, coal, paper

non-combustable substance

doesnt undergo combustion

stone, iron, glass, water, soil

conditions neccesary for combustion

supporter of combustion - oxygen

combustible substance

reaching the ignition temp

ignition temperature definition

the minimum temperature at which a substance catches fire/combusts

inflammable substance

substances which have low ignition temp and catch fire easily

fuels definition

combustible substances that can give useable and considerable amount of energy

calorific value

the amount of heat energy released on burning 1kg of a fuel

gives the efficeincy of a fuel

types of fuels

solid fuel -> coal, wood

liquid fuel -> petrol, kerosene

gaseous fuel -> LPG, CNG

types of combustion

rapid combustion

explosion

spontaneus combustion

rapid combustion

combustion where

heat and light are produced

at a fast and continuous rate

spontaneous combustion

combustion where the substance catched fire without any apparent reason or external cause

explosion

combustion where

heat light sound are produced suddenly once ignited

innermost zone of candle characteristics

colour -> black(dark zone)

temp -> least hot

combustion reaction -> no combustion

products formed -> unburnt wax particles

middle zone charateristics

colour -> yellow/orange

temp -> moderate hear

combustion reaction -> partial combustion

products formed -> unburnt carbon particles

outermost zone characteristics

colour -> blue

temp -> highest temp

combustion reaction -> complete combustion

products formed -> carbon dioxide

unit used to express calorific value

kilojuoles per kilogram

kj/kg