vibration - a rapid motion back and forth, vacuum - a space with nothing in it, not even air, frequency - the number of times a particular event or item appears. in a set of data, inaudible - impossible to hear, movement - the state of changing something's position, molecules - the smallest unit of a substance that has all the properties of that substance, decibels - a unit for measuring the loudness of sounds, states of matter - anything that takes up space and has weight, solid - objects that keep their own shape and do not flow in a given temperature, liquid - a form of matter that flows easily and is neither a solid nor a gas, gas - air-like substances that can move around freely or they might flow to fit a container,

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