Vocabulary / Key Terms

Solid: Matter in a state that has a definite shape and volume.

Liquid: Matter in a state that has a definite volume, but has no shape.

Gas: Matter as a state that has no definite shape or volume.

Volume:  the amount of space that an object takes up

Mass : the amount of matter in an object

Weight : a measure of how strongly gravity pulls on an object

State of Matter : one of three forms that matter can take

Melting Point : the particular temperature at which a substance changes state from solid to liquid

Evaporation : the slow changing of a liquid into a gas

Boiling Point :  the particular temperature in which a substance changes state from liquid to gas

Freezing Point : the particular temperature at which a substance changes state from liquid to solid

Sublimation : the process in which matter changes state from a solid directly into gas

Density : a measure of how tightly matter is packed in a given amount of space

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