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Nov 6, 2014



Nov 30, 2013



Nov 18, 2013

####      Why carbon dioxide gas is used to extinguished fire caused by petrol  Diesel or kerosene? Why not water?



In case of oil fires, water is not suitable for extinguishing the fire because diseal is less dense than water and will float in water. As water will spread, such the oil will spread and the fire will become mo...

Aug 18, 2015

#### Three examples of non combustible substances.



Examples of non-combustible substances are
rock,steel,water,sand etc.

Nov 12, 2013

#### I found the answer as 40000 KJ/Kg but the answer in the Learn Next NCERT Science Solution it is given as 4000KJ/Kg.When I referes to the Calculator it shown that 180000/4.5= 40000.



solution=  180000/4.5
=  1800000/4.5 as the decimal goes to N = numerator
=4000kj/kg
ok

Mar 8, 2015

#### dry leaves catch fire easily but it is difficult to burn a heap of green leaves ?



Green leaves contain moisture whereas dry leaves do not contain  moisture as a result, the ignition te...

Mar 4, 2014

#### what is the equation of soda acid fire extinguisher?



2NaHCO3 + H2SO4 ⇒ Na2SO4 + 2H2O + 2CO2

Aug 23, 2015

#### why are gaseous fuels better than solid and liquid ones?



Calorific value is defined as the amount of heat energy produced on complete combustion of 1 kilogram ...

Oct 22, 2013

#### EXAMPLE OF SLOW COMBUSTION ?



celluler respiration