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Science Vocab. 4
Term | Definition |
---|---|
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 |
Buoyancy | ability of a fluid--a liquid or a gas--to exert an upward force on an object immersed in the fluid |
Diffusion | spreading of particles throughout a given volume until they are uniformly distributed |
Heat of Fusion | amount of energy required to change a substance from the solid phase to the liquid phase |
Heat of Vaporization | the amount of energy required for the liquid at its boiling point to become a gas |
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 |
Melting Point | temperature at which a solid begins to liquefy |
Pascal | SI unit of pressure |
Plasma | matter consisting of positively and negatively charged particles |
Pressure | amount of force exerted per unit area; SI unit is the pascal |
Thermal Expansion | increase in the size of a substance when the temperature is increased |
Viscosity | a fluids resistance to flow |