Contraction
A reduction in size of an object
Degree Celsius
A unit used to measure temperature
Expansion
An increase in the size of an object
Good Conductor of Heat
A material that allows heat to flow through it easily
Heat
A form of energy that makes things warm
Light
A form of energy that helps us see
Poor Conductor of Heat
A material that does not allow heat to flow through it easily
Shadow
A dark area produced when light is blocked by an object
Sources of Light
Objects that give off light
Temperature
A measure of how hot something is
Thermometer
An instrument used to measure temperature
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