Def: Heat is a form of energy.

 

	Is measured in joules.
	Rail Tracks are tempered so they don’t buckle when they expand.
	Concrete Paths have spaces between them so they don’t crack.
	Thermostat: A device for keeping temperature fairly steady.
	Liquids expand when heated.

Water has its greatest density at 4°c and becomes less dense when it goes from 4°c to 0°c.

	The temperature of a substance is a measure of how hot the substance is.
	Thermometers work on the principle that liquids expand when heated and contact when cooled.

	Mercury 1. Easily Seen 2. Measures from -39°c to 357°c 3. Doesn’t wet/stick to glass. 4. Expensive		Alcohol 1. Easily Seen 2. Measures from –112°c to 78°c 3. Wets the glass 4. Cheap

 

 

 

 

 

 

 

	Clinical thermometer measures from 34°c to 43°c. Normal human body temperature = 37°c.
	Temperature indicates the level of heat in a body, not the amount of heat.

 

Def: Temperature is a measure of how hot a body is.