Question

the gas comes out from a cylinder is a Physical Change. How please explain.​

Answer 1

Explanation:

When the liquid comes out of the cylinder as gas, there are no new substances formed. There is a change of state in the matter. This change of state is called a physical change and is thus a reversible reaction. Hence, the process is never a chemical change

Answer 2

Answer:

Liquified petroleum gas is filled in the cylinder in the form of a liquid. When these liquids come out of the cylinder in the form of vapours, physical change takes place. When these vapours are mixed with air and burn, chemical change takes place.