matter, Anything that has mass and takes up space. Everything you can see and touch is made of this., volume, The space that matter takes up., particles, Tiny things that all matter is made from, Solid, Matter whose particles are rigid. It has a fixed shape and keeps the same volume., Liquid, Matter whose particles are fluid. It does not have a fixed shape, but always has the same volume., Gas, Matter whose particles are fluid. It does not have a fixed shape and does not have a fixed volume., Changing State, When matter changes from one state into another state, which happens when matter loses or gains energy (e.g., through temperature changes)., Melting, The process when a solid changes into a liquid., Freezing, The process when a liquid changes into a solid., Evaporation, The process when a liquid changes into a gas, Condensation, The process when a gas changes into a liquid, Melting Point / Freezing Point, The specific temperature at which a substance melts or freezes (e.g., Water melts and freezes at $0^\circ\text{C}$)., precipitation, water that falls from the clouds towards the ground, especially as rain or snow: Hail and sleet are types of this

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