hydrogen
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This isn't a very good question because it has a LOT of different answers that can all be correct. The answer your teacher wants is probably hydrogen, but any flammable gas will explode if mixed with oxygen in sufficient concentration and exposed to a spark. So...I think I would put down propane. There are a lot of really fun chemicals you could list - carbon monoxide, diborane, hydrogen cyanide, methane - but propane is very common and it will do exactly what the question stipulates.
It is harmful to inhale. and can be lethal if it ignites or explodes.
No because they are in the air part of earth so they evaporate and create a steam that hits the cool area with makes a thin ice that explodes during the night and turns it into a small ball of gas.
Air (carbon dioxide in nitrogen)
If there is very little oxygen present, the flame should turn blue.
Acetylene is a colourless, combustible gas with a distinctive odour.When acetylene is liquefied, compressed, heated, or mixed with air, it becomes highly explosive.
air
It is methane gas which is flammable.
More fresh air mixed with the gas. Better performance.
It is important to check that the gas is alight because you have to make the oven warm up
Opening the air hole collar to mix air with the fuel gas results in a hotter flame.
Producer gas produces a mixed air which helps in producing high temperatures.
Nitrogen mixed with normal air
Things explode because they are usually blown up using dynamite or other explosives. If a business or home explodes it could be from a gas leak or chemicals being mixed together.
once smoke touches gas it EXPLODES!
Because oxygen is required for something to burn. The air mixture adds the oxygen to the gas and allows burning to take place.
A star that explodes is called a supernova.
Things explode because they are usually blown up using dynamite or other explosives. If a business or home explodes it could be from a gas leak or chemicals being mixed together.