Science Vocab. 4
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| Boiling Point | The temperature at which the pressure of the vapor in the liquid is equal to the external pressure acting on the surface of the liquid
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| Buoyancy | ability of a fluid--a liquid or a gas--to exert an upward force on an object immersed in the fluid
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| Diffusion | spreading of particles throughout a given volume until they are uniformly distributed
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| Heat of Fusion | amount of energy required to change a substance from the solid phase to the liquid phase
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| Heat of Vaporization | the amount of energy required for the liquid at its boiling point to become a gas
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| Kinetic Theory | explanation of the behavior of molecules in matter; states that all matter is made of constantly moving particles that collide without losing energy
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| Melting Point | temperature at which a solid begins to liquefy
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| Pascal | SI unit of pressure
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| Plasma | matter consisting of positively and negatively charged particles
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| Pressure | amount of force exerted per unit area; SI unit is the pascal
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| Thermal Expansion | increase in the size of a substance when the temperature is increased
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| Viscosity | a fluids resistance to flow
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