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Flashcards in HVAC And Refrigeration Deck (304)
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Anything that has weight and occupies space

Matter

1

Three states of matter

Solid, liquid, gas

2

The measurement of the presence and intensity of heat on a fahrenheit or Celsius scale

Temperature

3

Equal to 1/180th of the difference between the freezing point and boiling point of water at sea level

One degree fahrenheit

4

Equal to 1/100th of the difference between the freezing point and boiling point of water at sea level

One degree celsius

5

Two types of heat

Sensible, latent

6

Measurable heat that causes a change in temperature without a change in the state of the matter

Sensible heat

7

This type of heat can be detected by touch and thermometer

Sensible heat

8

What kind of heat is added to raise the water temperature

Sensible heat

9

Hidden heat

Latent heat

10

Causes a change in state of a substance without a change in temperature or pressure

Latent heat

11

Cannot be detected by a thermometer

Latent heat

12

Types of latent heat

Vaporization, condensation, freezing, melting

13

Heat added to a liquid to change it to a vapor without a change in temperature

Vaporization

14

Heat removed from a vapor to change it to a liquid without a change in temperature

Condensation

15

Heat removed to change the state of a substance from a liquid to a solid, without a change in temperature

Freezing

16

Heat added to change the state of a substance from a solid to a liquid, without a change in temperature

Melting

17

Difference in heat energy causes

Heat flow

18

Laws of heat flow

Heat will always flow from a warmer to a cooler substance, there must be a temperature difference for heat to flow, the greater the temperature difference the faster heat will flow

19

Transfer of heat by direct rays

Radiation

20

Transfer of heat by direct contact of the two objects

Conduction

21

Transfer of heat by means of a medium being circulated

Convection

22

BTU

British thermal unit

23

The amount of heat required to change the temperature of one pound of pure water one degree fahrenheit, at atmospheric pressure

BTU

24

Refers to the temperature of a substance measured in degrees by a thermometer

Heat intensity

25

The theoretical point at which a substance would contain no heat and all molecular motion would cease

Absolute zero

26

Absolute zero

-459.7•F

27

The condition when a substance (vapor) contains all of another substance (liquid) that it can hold

Saturation

28

The additional heat beyond that required to produce saturation at any specific pressure

Superheat

29

The cooling of a liquid so that its temperature is reduced below the corresponding saturation temperature

Subcool