Heat

Question 1

What is temperature?

Answer 1

The measure of the average KE of the particles of an object.

Question 2

What is temperatures variables?

Answer 2

Does not vary with mass.

Question 3

What is thermal expansion?

Answer 3

The increase of the volume of a substance due to an increase in the temperature. (Heat makes lower temperature objects expand.)

Question 4

What is the SI unit of temp?

Answer 4

Kelvin=K

Question 5

Freezing temps of water?

Answer 5

32°F, 0°C, 273 K

Question 6

Boiling temps of water?

Answer 6

212°F, 100°C, 373 K

Question 7

What is absolute zero?

Answer 7

The lowest temp on the kelvin scale= 0 kelvin= no particle motion (Called 0K).

Question 8

What is heat?

Answer 8

The process of transferring energy between objects which are at two different temps. The thermal energy ALWAYS goes from the higher temp object to the lower temp object until both objects are at the same temp which is called thermal equilibrium.

Question 9

Heat variables?

Answer 9

Varies with mass and temp and specific heat capacity

Question 10

What is thermal energy?

Answer 10

The total KE of all the particles which make up the whole substance.

Question 11

Thermal energy variables?

Answer 11

Varies with mass and temp.

Question 12

What is the SI unit of thermal energy?

Answer 12

Joules= J

Question 13

What is thermal equilibrium?

Answer 13

When energy is transferred from a higher temp object to the lower temp object until both are at the same temp.

Question 14

What is conduction?

Answer 14

The transfer of energy from one substance to another through direct contact.

Question 15

What is a conductor?

Answer 15

Substances that conduct thermal energy very well.

Question 16

Conductor example?

Answer 16

Iron skillet

Question 17

What is an insulator?

Answer 17

Substances that do not conduct thermal energy very well.

Question 18

What is convection?

Answer 18

The transfer of energy by the movement (Circulation) of a liquid or a gas.

Question 19

What is radiation?

Answer 19

The transfer of thermal energy through matter or space as waves. (The Sun!)

Question 20

What is thermal conductivity?

Answer 20

The rate at which a substance conducts thermal energy.

Question 21

What is a heat engine?

Answer 21

A machine that uses heat to do work. (2 types)

Question 22

What is an external combustion engine?

Answer 22

To burn fuel outside the engine.

Question 23

External combustion engine example?

Answer 23

Steam engine.

Question 24

What is an internal combustion engine?

Answer 24

To burn fuel inside the engine.

Question 25

Internal combustion engine example?

Answer 25

Car engine.

Question 26

What is a heat pump?

Answer 26

Moves energy to increase or decrease the temperature.

Question 27

What is a heat pump used for cooling?

Answer 27

Energy is taken from the air inside the house and the energy is pumped outside (A.C.) (Inside to outside)

Question 28

What is a heat pump used for heating?

Answer 28

Energy is taken from the air outside the house and the energy is pumped inside. (A Heater) (outside to inside)