How is gas released from a gas cylinder?

Propane gas

Here's what happens when some quantity of a gas is compressed into a cylinder. (The term "amount" in the question is rather slippery.) -- The mass of the gas doesn't change. -- The weight of the gas...

methyl mercaptan

methyl isocyanate (MIC) gas

When we fill a cylinder with compressed gas, we do so based on a strict set of guidelines. The cylinder must be the correct type for that gas. It must have a "recent" hydrostatic test date, or in...