What is Heat?
A form of energy that results from the motion of particles in matter
Heat
What process is taking place when a gas changes to a liquid
Condensation
Thermometer
The amount of heat needed to raise the temperature of 1 gram of water by 1 degree Celsius.
Calorie
The movement of energy through a vacuum.
Radiation
A place where heat comes from
Heat source
Heat causes particles in matter to push farther apart, or _________.
Expand
A unit of measurement on a temperature scale.
Degree
Suppose 15g of water are heated from 12oC to 22oC. How many calories are needed?
15 x 10 = 150 calories
The movement of heat energy from one molecule to the next
Reaction that occurs when atoms are split and energy is released.
Nuclear Fission
Contract
The temperature at which a substance changes from a liquid to a gas
Boiling Point
If two objects that have the same temperature have a different mass, which object gives off the most heat?
The object with the larger mass.
Material that does not conduct heat well
Insulator
Reaction that occurs when atoms are joined together and energy is released
Nuclear Fusion
What process is taking place when a liquid changes to a gas?
Evaporation
Temperature scale where water freezes at 0o and boils at 100o
Celsius Scale
Suppose 16g of water are cooled from 13oC to 1oC. How much heat is given off?
16 x (-12) = -192 calories
Flow of energy that occurs when a warm liquid or gas rises
Convection
Does heat energy flow from a warmer object to a cooler object? Or from a cooler object to a warmer object?
Warm to Cool
Why does the amount of water decrease when it is boiled?
F=1.8 x C + 32
Convert 12oC to oF
F=1.8 x C + 32
F=1.8 x (12) + 32
F=21.6 + 32
F=53.6oF
Suppose 25g of water are heated from 0oC to 5oC. How many calories are needed?
25 x 5 = 125 calories
How does heat move by conduction?
Travels from one molecule to the next