Here's why:

* Stick Deodorants: These are solid blocks of deodorant that melt slightly when applied to the skin.

* Aerosol Deodorants: These contain a propellant (usually a gas) that forces the deodorant out of the can in a spray. The deodorant itself is typically a mixture of solids and liquids.

Even in aerosol deodorants, the deodorant itself is a solid or liquid, not a gas. The gas is the propellant that helps it be sprayed, but the deodorant itself is the substance that provides odor protection.