I need definitions for science...?

yea i recommend the same, dictionary.com

Gas - A form of matter which does not have a definite shape and has the ability to diffuse freely from a high concentration gradient to a low concentration gradient.

Physical Properties - Characteristics of matter which are physically perceptible and/or tangible (eg. volume, shape, mass, size)

Sublimation - The process of solids vaporizing directly into gas without turning into liquid first (eg. weathering)

Condesation - Condensation, in basic definition, is the process where gas turns into liquid.

Volume - Amount of space occupied by matter.

Those are just the basic definitions. Next time, try not to miss school like I did =p

Gas - a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid.

Google.

Look in the back of your text book.

dictionary.com

and look for the definition under physics

Your gonna hate me for this but you need to do this yourself.

yeah what everybody else said.

umm ever heard of a dictionary???? do your own homework, i have enough with mine