Temperature & Heat TEMPERATURE: a measure of how rapidly or how slowly molecules move around.

Temperature&

Heat

TEMPERATURE: a measure of how rapidly or how

slowly molecules move around

A. Kinetic Energy- Energy of Motion

B. Logically then, the hotter an object the

GREATER the kinetic energy it has or the

FASTER the molecules are moving in the

object.

C. Temperature is a measure of the MOTION of the

molecules.

What is Temperature?

D. Temperature is a measure of the kinetic energy of the molecules.

1. The cooler an object, the

SLOWER the molecules

2. The hotter an object the FASTER

the molecules

3. Absolute zero must be the

temperature at which all molecular

motion STOPS

A. Heat is a QUANTITY of

energy related to the kinetic motion of the molecules.

At what temperature does

water boil?

100 oC

1. Therefore, what is the temp of a cup

of boiling water?

100 oC

2. What is the temp of a gallon of boiling water?

100 oC

3. Which contains more heat a cup or a gallon of boiling

water?

A gallon because it contains a lot more

molecules.

B. Heat always flows from a HOT object or region to a COLD object or

region.

1. The object that is hot is call the

SOURCE

2. The object that is cold is called the

SINK.

3. Therefore, heat energy always flows from a

SOURCE to a SINK.

4. While sitting in a room now are you a source or a sink?

SOURCEbecause you are hotter than the

room

5. When you touch a light bulb that has

been on for a while the heat will flow from the LIGHT BULB to

YOUR HAND

6. How can a hunk of Ice be

considered a heat source.

Everything has heat! If the ice were in a

location where the temperature was colder than the ice, then the ice would give off heat

to the environment.

C. What is your body temperature?

98.6 oF37 oC

C. What is your body temperature?

1. What does it mean if YOU think something is Hot?

1.What does it mean if YOU think

something is Hot?The object’s

temperature is much greater that yours.

2. What does it mean if YOU think

something is Warm?

2. What does it mean if YOU think

something is Warm?The object

temperature is a little greater than yours.

3. What does it mean if YOU think something is Cool?

3. What does it mean if YOU think

something is Cool?The object’s

temperature is slightly less than yours.

4. What does it mean if YOU think something is Cold?

4. What does it mean if YOU think

something is Cold?The object’s

temperature is much less than yours.

2. Each of these terms are called relative terms.

Relative means in order for them to

have meaning they must be comparing two or more things.

What do you think it means when a

scientist says there is no such thing as

COLD?

EVERYTHING GIVES OFF HEAT!