1. Has a definite volume but its shape changes to match its container
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Liquid
Has a definite volume but its shape changes to match its container
Example: Milk
Gas
Does not have a definite shape or volume
Example: Water vapor

2. Has a definite shape and volume that do not change
Solid
Has a definite shape and volume that do not change
Example: Ice
Anything that has mass and takes up space
Matter

3. The process by which a gas changes into a liquid due to cooling
Condensation
The process by which a liquid changes into a gas due to the addition of heat 
Evaporation

4. A quality or trait belonging to an individual or thing; can be used to identify substances
Physical Properties