Phase changes - A physical change of a substance from one state to another , Atom - Tiny particles that are the basic building blocks of all matter. Consists of protons,neutrons and electrons. , Thermal Energy - Heat energy , Kinetic energy - Energy of motion , Temperature - This DOES NOT CHANGE DURING a phase change, Solid - State of matter where molecules are tightly packed together in a regular pattern. Molecules can vibrate in a limited area Definite shape volume; low compressibility, low fluidity, Liquid - State of matter where molecules are loosely packed and can easily flow past each other. Definite volume, indefinite shape; low compressibility., Gas - high State fluidity. of matter where molecules are spread far apart and are flying m all directions. Indefinite shape and volume; High fluidity and high compressibility., Fluidity - Something's ability to flow, Compressibility - The ability to force something into less space, Freezing - Liquid to solid, Melting - Solid to liquid, Vaporization - When a liquid changes to a gas; there are two types of this phase change: Evaporation & Boiling , Evaporation - Liquid to gas; usually occurs on the surface and can happen below the boiling point , Boiling - Liquid to a gas; happens throughout the entire liquid once the has reached a certain temperature, Condensation - Gas to a liquid , Sublimation - solid directly to a gas , Solidifacation - gas directly to a solid , Boiling point - The temperature at which a liquid changes to a gas., Melting point - The temperature at which a solid changes to a liquid, Freezing point - The temperature at which a liquid changes to a solid, Dew point - The temperature at which a gas changes to a liquid, Water vapor - The gas state of water, Conservation of mass - Matter can neither be created nor destroyed. The mass of an object never changes, no matter how the parts are rearranged,

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