Evaporation - Phase change when a liquid turns into a gas., Gas - State of matter in which a substance has no definite shape or volume., Kinetic Energy - Energy associated with moving objects., States of Matter (also known as phases of matter) - Solid, Liquid, Gas (and Plasma), Melting - Phase change when a solid turns into a liquid., Mass - The amount of matter in an object (measured in grams or kilograms), Freezing - Phase change when a liquid turns into a solid, Liquid - State of matter in which a substance has a definite volume but no definite shape., System - Group of objects that function together as one unit; A set of related objects under study or consideration, Temperature - A measure of how hot or cold in Celsius, Fahrenheit, and Kelvin., Thermal Energy - A form of kinetic energy associated with molecules in motion; involves a transfer in heat, Particles - Another word for atoms and molecules, Atom - The smallest unit of matter that cannot be broken down by ordinary chemical reactions , Molecule - Two or more atoms connected by a chemical bond,

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