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

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Presentation transcript:

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 o C

1. Therefore, what is the temp of a cup of boiling water?

100 o C

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

100 o C

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?

SOURCE because 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 o F 37 o C 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!