Answer: Normally, the gas is stored in liquid form under pressure in a steel container, cylinder or tank. As the liquid boils, it draws the heat energy from its surroundings.

Compressing air does not necessarily heat it up. For example, if the compression happens very slowly and the container is a good heat conductor, the temperature of the gas remains a constant. However, if the container is perfectly insulated or the process happens very rapidly, the temperature of the gas raises.

Non-liquefied gases are also known as compressed, pressurized or permanent gases. These gases do not become liquid when they are compressed at normal temperatures, even at very high pressures. Common examples of these are oxygen, nitrogen, helium and argon.

Acetylene, ammonia, hydrogen, propane, propylene and methane are all flammable gases, also known as fuel gases. They burn when mixed with an oxidant and provided with a source of ignition.

A substance is considered highly flammable if its ignition point is lower than 90 degrees F.

The explosion of the molten azides is due to self-heating of the liquid. Explosion is facilitated by the presence of an inert gas above the decomposing liquid. During decomposition nitrogen is the main gaseous product. The products of reaction may be either atomic nitrogen or excited molecules of nitrogen.

HNIW

PETN. One of the most powerful explosive chemicals known to us is PETN, which contains nitro groups which are similar to that in TNT and the nitroglycerin in dynamite. But the presence of more of these nitro groups means it explodes with more power.