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Acetylene is different from most gasses in a tank. An acetylene tank is not hollow- it contains a porous material (think of a hard sponge) that is saturated with liquid acetone. When acetylene is pumped into the tank under pressure, it dissolves in the liquid. This is similar to how carbon dioxide dissolves in a soda (in a bottle or an) under pressure. While in the tank, it is mainly in a liquid.
The gas dissolves when under pressure in a liquid. When the pressure is released the gas expands rapidly causing the fizz.
Gases
It is under lower pressure, however, it is under pressure enough to compress it into a liquid.
At room temperature it is solid but under different pressure and temperature conditions it could be a liquid or gas (as can anything else).
Pressure energy per unit volume is equal to the pressure and per unit mass is equal to the density of the liquid. When an incompressible liquid flows out of a tank in which the pressure is maintained , the liquid under pressure possesses potential energy.
Under pressure it is a liquid.
Oxygen stored as liquid is highly flammable.
Petrol, or gasoline, at standard temperature and pressure is a liquid.
Propane is a gas under normal conditions of pressure and temperature, but is normally storm under high pressure as a liquid.
Under normal temperature and atmospheric pressure conditions propane is gaseous. However, when the temperature is reduced to below −42.09 °C or when it is stored under high pressure (approx 177 psi), it takes the form of a liquid.