Question

define vapour
define gas​

Answer 1

Answer:

vapor refers to a gas-phase material that that normally exists as a liquid or solid under a given set of conditions. As long as the temperature is below a certain point (the critical temperature; this varies for each substance), the vapor can be condensed into a liquid or solid with the application of pressure.

Answer 2

Explanation:

1. A vapor refers to a gas-phase material that that normally exists as a liquid or solid under a given set of conditions.
2. a substance or matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape (unlike a solid) and no fixed volume (unlike a liquid).