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States of Matter

Chapter 3 Section 1 Physical Science

TermDefinition
solid This substance has a definite shape and definite volume
Liquid This substance has a definite volume but no shape of its own.
Fluid A substance that flows.
Surface Tension An inward pull among the molecules of a liquid that brings the molecules on the surface closer together.
Viscosity A liquids resistance to flowing.
Gas A substance that has no definite shape or volume.
How do crystalline and amorphous solids differ? Crystalline solid: particles arranged in a regular, repeating pattern; distinct melting point. Amorphous solid: particles not in a regular pattern; no distinct melting point.
What property of liquids causes water to form droplets? Surface tension
How does breathing demonstrate that gases are fluids? While you're breathing, gases in the air flow freely through the body and back out again.
How do the positions and movements of particles a liquid help to explain the shape and volume of the liquid? Because its particles can move freely around one another, a liquid takes the shape of its container. Because its particles are packed closely together, a liquid has a definite volume.
What determines the shape and volume of a gas inside a container? The shape and volume of a gas are the same as those of its container.
Created by: Tom Radeke