Devlin-PNHS-Intro to I.S. Vocab

Question Answer
What is a solid? The state of matter in which a substance has a definite shape and volume.
What is a liquid? The state of matter in which a substance has a definite volume, but not a definite shape.
What is a gas? The state of matter in which a substance has neither a definite shape or volume.
What is kinetic energy? The energy an object has due to its motion.
What is pressure? The result of force distributed over an area.
What is absolute zero? A temperature of 0 Kelvins.
What is "Charle's Law"? The direct proportion of a gas to its temperature (in Kelvins) if the pressure and number of particles of the gas are constant.
What is "Boyle's Law"? The inverse variation of the volume of a gas with a pressure if the temperature and the number of particles are constant.
What is a phase change? A reversible physical change that occurs when a substance changes from one state of matter to another.
What does "endothermic" mean? A description of change in which a system absorbs energy from its surroundings.
What is "heat of fusion"? The amount of energy absorbed. Measured in joules.
What does "exothermic" mean? A description of change in which a system releases energy to its surroundings.
What is vaporization? The phase change in which a liquid turns into a gas.
What is evaporation? The process that changes a substance from a liquid to a gas at temperatures below the substance's boiling point.
What is vapor pressure? The pressure caused by collisions of particles in a vapor with the walls of a container.
What is "heat of vaporization"? The energy a substance must absorb in order to change from a liquid to a gas.
What is condensation? The phase change in which a substance changes from a gas or vapor into a liquid.
What is sublimation? The phase change in which a substance changes from a solid to a gas or vapor without changing to a liquid first.
What is deposition? The phase change in which a gas or vapor changes into a solid without changing into a liquid first.

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