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Glossary of 8th grade science chapter 3: Solids, Liquids, and Gases

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Solid
A state of matter with a definite Shape and a Definite Volume.
Crystalline Solid
A solid that is made up of crystals in which particles are arranged in a regular, repeating pattern.
Amorphous Solid
A solid made up of particles that are not arranged in a regular pattern.
Liquid
A state of matter that has no definite shape but does have a definite volume.
Fluid
A substance that can easily flow.
Surface Tension
The result of an inward pull among the molecules of a liquid that brings the molecules on the surface closer together.
Viscosity
A liquid’s resistance to flowing.
Gas
A state of matter with no definite shape or volume.
Melting
The change from a solid to a liquid state of matter.
Melting Point
The temperature from which a substance changes from a solid to a liquid.
Freezing
The change from a liquid to a solid state of matter.
Vaporization
The change of state from a liquid to a gas.
Evaporation
The process that occurs when vaporization takes place only on the surface of a liquid.
Boiling
The process that occurs when vaporization takes place inside a liquid as well on the surface.
Boiling Point
The temperature at which a substance changes from a liquid to a gas.
Condensation
The change from the gaseous to the liquid state of matter.
Sublimation
The change in state from a solid directly to a gas without passing through the liquid state.
Pressure
The force exerted on a surface divided by the total area over which the force is exerted.
Boyle’s Law
A principle that describes the relationship between the pressure and volume of a gas at constant temperature.
Charles’s Law
A principle that describes the relationship between the temperature and volume of a gas at constant pressure.
Graph
A diagram that shows how two variables are related.
Origin
The (0, 0) point on a line graph.
Directly Proportional
A term used to describe the relationship between two variables whose graph is a straight line passing through the point (0, 0).
Vary Inversely
A term used to describe a relationship between two variables whose graph that curves that slopes downward.
Thermal Energy
T_______ energy always flows from a warmer to cooler substance
A substance changes state ....when its thermal energy....
A substance changes _____ when its _______ energy increases or decreases by a sufficient amount.
MELTING
change from solid to liquid state of matter
FREEZING
Change in state from a liquid to a solid
VAPORIZATION
change from liquid to gaseous state
EVAPORATION
process that occurs when vaporization takes place only on the surface
BOILING
vaporization that occures on and below the surface of a liquid
CONDENSATION
change from gaseous to liquid state of matter
SUBLIMATION
change in state from a solid directly to a gas without passing through the liquid state

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