Question

..why is the burning of LPG gas from a cylinder considered both a physical and chemical change..​

Answer 1

Burning of LPG involves both physical and chemical changes because when LPG comes out of cylinder and is converted from liquid to gaseous state it is a physical change. When the gas burns in air it is a chemical change.

Answer 2

Answer:

when then gas comes out from cylinder it coverts into liquid it is physical change and when the gas burns in air it is chemical change