Phase Changes - A physical change of a substance from one state of matter 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 in 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 a solid, Melting - Solid to a liquid, Vaporization - When a liquid changes to a gas; there are two types of this phase change: evaporation and boiling, Evaporation - Liquid to a 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 liquid has reached a certain temperature, Condensation - Gas to a liquid, Sublimation - - Solid directly to a gas, Solidification - - 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 - 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, Condensation - The temperature at which a gas changes to a liquid,

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