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Solid

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A state of matter characterized by particles arranged such that their shape and volume are relatively stable.

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Liquid

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A state of matter with a definite volume but no fixed shape, and it adapts to the shape of its container.

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Surface tension

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The elastic tendency of a fluid surface which makes it acquire the least surface area possible.

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Viscosity

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A measure of a fluid's resistance to flow.

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Gas

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A state of matter consisting of particles that have neither a defined volume nor defined shape.

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Thermal Energy

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The internal energy of an object due to the kinetic energy of its atoms and/or molecules.

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Temperature

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A measure of the average kinetic energy of the particles in a system.

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Melting point

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The temperature at which a solid becomes a liquid at atmospheric pressure.

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Freezing point

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The temperature at which a liquid turns into a solid.

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Vaporization

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The phase transition from liquid to gas.