Heat, Temperature, and Pressure

Question 1

Temperature

Answer 1

A word used to describe the level of heat or molecular activity, expressed in Fahrenheit, Ranking, Celsius, or Kelvin units.

Question 2

Pressure

Answer 2

Force per unit area.

Question 3

Heat

Answer 3

Energy that causes molecules to be in motion and to raise temperature of a substance.

Question 4

Atmospheric Pressure

Answer 4

The weight of the atmospheres gases pressing down on the earth. Equal to 14.696 psi at sea level and 70 °F.

Question 5

Heat Intensity

Answer 5

Another term for temperature.

Question 6

Conduction

Answer 6

Heat transfer from one molecule to another within a substance or from one substance to another.

Question 7

Rakine

Answer 7

The absolute Fahrenheit scale with 0 at the point where all molecular motion stops.

Question 8

Kelvin

Answer 8

A temperature scale where absolute 0 equals 0 or where molecular motion stops at 0. It has the same graduations per degree of change as the Celsius scale.

Question 9

British Thermal Units (BTU)

Answer 9

The amount (quantity) of heat required to raise the temperature of 1 lb of water by 1 °F.

Question 10

Forced Convection

Answer 10

The movement of fluid by mechanical means.

Question 11

Natural Convection

Answer 11

The natural movement of a gas or fluid caused by differences in temperature.

Question 12

Convection

Answer 12

Heat transfer from one place to another using a fluid.

Question 13

Sensible Heat

Answer 13

Heat that causes a change in temperature.

Question 14

Radiation

Answer 14

Passes through air, heating the first solid object with which the heat comes in contact.

Question 15

Latent Heat

Answer 15

Heat energy absorbed or rejected when a substance is changing state and there is no change in temperature.

Question 16

Specific Heat

Answer 16

The amount of heat required to raise the temperature of 1 lbs of a substance 1 °F.

Question 17

Latent Heat of Fusion

Answer 17

The amount of heat energy required to change the state of substance from a liquid to solid or from a solid to a liquid.

Question 18

Standard Condition

Answer 18

Air at sea level at 70 degrees F when the atmosphere’s pressure is 14.696psia(29.92 in. Hg.). Air at this condition has a volume of 13.33ft^3/lb

Question 19

Bourbon Tube

Answer 19

C-shaped tube manufactured of thin metal and closed on one end. When pressure is increased inside, it tends to straighten. It is used in a gauge to indicate pressure.

Question 20

Barometer

Answer 20

A device used to measure atmospheric pressure that is commonly calibrated in inches or millimeters of mercury.

Question 21

Low-Side Gauge

Answer 21

The gauge that measures the low-side pressure in an air-conditioning or refrigeration system.

Question 22

High-Side Gauge

Answer 22

A term used to indicate the high pressure or condensing side of the refrigeration system.

Question 23

High-Pressure Gauge

Answer 23

The gauge used to measure the pressure on the high-pressure side of an air-conditioning or refrigeration system.

Question 24

Compound Gauge

Answer 24

A gauge used to measure the pressure above and below the atmosphere’s standard pressure. It is a Bourdon tube sensing device and can be found on all gauge manifolds used for air-conditioning and refrigeration service work.