Thermal expansion - increase in size of a substance when the temperature is increased, Plasma - matter that has enough energy to overcome attractive forces between particles and inside the atom, sublimation - process when a solid changes directly into a gas without being a liquid, heat of vaporization - amount of energy needed for liquid at boiling point to become gas, boiling point - temperature where pressure of vapor in liquid is equal to external pressure acting on surface of liquid, heat of fusion - energy needed to change a substance from solid to liquid, melting point - temperature at which a solid becomes a liquid, kinetic theory - explanation of how the particles in a gas behaves, Buoyancy - ability of a fluid-liquid or gas- to exert an upward force on an object inside it, Pressure - force exerted per unit area, Viscosity - the resistance of a fluid to flowing, Boyle's law - if you decrease the volume of a container of gas and keep the temperature constant, pressure will increase, Charles's law - the volume of gas increases with increasing temperature as long as pressure stays the same,

Grade 9 Chapter 6

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