Unit 2: Molecular Motion

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Solid

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One of the three main states of matter, along with liquid and gas. In a solid, particles are packed closely together and are not free to move about within the substance.

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Liquid

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Composed of molecules that move freely among themselves but do not tend to separate like those of gases; neither gaseous nor solid.

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Gas

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A substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid.

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Plasma

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A highly ionized gas containing an approximately equal number of positive ions and electrons.

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Density

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Degree of consistency measured by the quantity of mass per unit volume.

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Volume

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The amount of space, measured in cubic units, that an object or substance occupies.

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Pressure

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Force per unit area.

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Mass

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A measure of the amount of matter in an object. Mass is usually measured in grams (g) or kilograms (kg).

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Temperature

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A quantitative measure of how hot or cold something is.

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Solute

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What is dissolved in a solution, e.g., the salt in saltwater.