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6th Grade Ch 4

States of Matter

TermDefinition
matter anything that has mass and takes up space
solid matter with a definite shape and volume
liquid matter with a definite volume but no definite shape
gas matter that does not have a definite shape or definite volume
viscosity a liquids resistance to flow
surface tension the uneven forces acting on the particles on a surface of a liquid
thermal energy the total kinetic and potential energy of all the particles in a sample of matter
temperature the average kinetic energy of the individual particles of a substance
heat movement of thermal energy from a higher temperature to a lower temperature
melting the change from a solid state to a liquid state
freezing the change from a liquid state to a solid state
vaporization the change from a liquid to a gas
boiling vaporization that occurs at the bottom of a liquid and moves toward the top
evaporation vaporization that occurs at the surface of a liquid
condensation the change from a gas to a liquid; opposite of vaporization
pressure equal to the force exerted on a surface divided by the total area over which the force is exerted; measured in pascals
buoyant force upward force exerted on an object immersed in a fluid
Archimedes' principle the buoyant force on an object is equal to the weight of the fluid displaced by the object
density mass divided by volume; determines if an object will sink or float
Pascal's principle when a force is applied to a confined fluid, an increase in pressure is transmitted equally to all parts of the fluid
atmospheric pressure the weight of the atmosphere pushing down on a object
Created by: MsHollinger