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Heat
Chapter 9
23
Science
9th Grade
04/02/2017

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Term
boiling point
Definition
the temperature @ which a substance changes from a liquid to a gas under normal atmospheric pressure.
Term
calorie
Definition
a unit of heat.
Term
celsius scale
Definition
the temperature scale used by scientists & by people in many countries, in which water freezes @ 0" & boils @ 100".
Term
condensation
Definition
to change from a gas to a liquid.
Term
conduction
Definition
the movement of heat energy from 1 molecule to the next.
Term
conductor
Definition
material through which heat travels easily.
Term
contract
Definition
to become smaller in size.
Term
convection
Definition
flow of energy that occurs when a warm liquid or a gas rises.
Term
degree
Definition
a unit of measurement on a temperature scale.
Term
evaporate
Definition
to change from a liquid to a gas.
Term
expand
Definition
to become larger in size.
Term
fahrenheit scale
Definition
the temperature scale commonly used in the United States in which water freezes @ 32" & boils @ 212".
Term
freezing point
Definition
the temperature @ which a liquid changes to a solid.
Term
heat
Definition
a form of energy resulting from the motion of particles in matter.
Term
heat source
Definition
a place from which heat energy comes.
Term
insulator
Definition
material that does not conduct heat well.
Term
melting point
Definition
the temperature @ which a solid changes to a liquid.
Term
nuclear fusion
Definition
the reaction that occurs when atoms are joined together & energy is released.
Term
nuclear fission
Definition
the reaction that occurs when the nuclease of an atom splits & energy is released as heat & light.
Term
radiation
Definition
the movement of energy through a vacuum.
Term
temperature
Definition
a measure of how fast an object's particles are moving.
Term
thermometer
Definition
a device that measures temperature.
Term
vacuum
Definition
space that contains no matter.
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