Theory

Front 1

Formula for °C to °F

Back 1

(°C*1.8)+32=°f

Front 2

Formula for °F to °C

Back 2

(°F-32)÷1.8=°C

Front 3

Formula for °F to °R rankine

Back 3

°F+460=°R

Front 4

Formula for °C to °K

Back 4

°C+273=°K

Front 5

Formula for °R to °F

Back 5

°R-460=°F

Front 6

Define - absolute pressure

Back 6

A system of pressure measurement with a starting point in a perfect vacuum. Imperial - 0 psi. Metric - 0 kPa.

Front 7

Define - absolute temperature

Back 7

A system of temperature measurement based on either a starting or zero point, where there is no heat and molecular motion theoretically stops. Imperial - 0°R or - 460°F. Metric - 0 K or - 273°C.

Front 8

Define - absorb

Back 8

A process where one substance attracts and holds another substance.

Front 9

Define - adiabatic compression

Back 9

The compression of Refrigerant gas without removing or adding heat.

Front 10

Define - adiabatic process

Back 10

A change in the pressure, volume and temperature of a vapor without a change in that vapours heat content. The Vapor does not heat or cool its surroundings when experiencing an adiabatic process

Front 11

Define - ambient temperature

Back 11

The average temperature of the media that surrounds a point.

Front 12

Define - atmospheric pressure

Back 12

the force per unit area due to gravity applied to the air surrounding the earth

Front 13

Define - atom

Back 13

The smallest constant property and size of any single element

Front 14

Define - back pressure

Back 14

The low pressure of a refrigeration system also called low side pressure, suction pressure, and evaporator pressure

Front 15

Define - barometer

Back 15

An instrument that measures atmospheric pressure.

Front 16

Define - bourdon tube

Back 16

A flat and curved pipe sealed at one end and open to the pressures read at the other end. And increase or decrease in pressure within the tube applied at the open-end causes the tube to move a needle which indicates the pressure value within the tube

Front 17

Define - Boyle's law

Back 17

A decrease in the volume of an ideal gas that has a constant temperature results in a proportional increase in pressure of that a decrease in the pressure of an ideal gas will result in a proportional volume increase changes in the pressure and volume of an ideal gas are inversely proportional as long as the temperature remains constant.

Front 18

Define - British thermal unit (btu)

Back 18

The heat energy unit of the imperial measurement system and the amount of heat required to raise the temperature of 1 pound of water by 1 Fahrenheit degree

Front 19

Define - British thermal unit per hour (Btuh)

Back 19

A Time reference to BTU input or output rates. A value in btuh is how many BTUs are used per hour

Front 20

Define - change of state

Back 20

The dynamic process of form transfer. The changes of state are melting, freezing, evaporating, condensing, sublimating

Front 21

Define - Charles laws

Back 21

1. A change in the temperature of an ideal gas at constant pressure results in a proportional volume change in that gas.

2. A change in absolute pressure of an ideal gas at constant volume results in a proportional absolute temperature change for that gas.

Front 22

Define - condensate

Back 22

The moisture gained from a condensing process.

Front 23

Define - condensation

Back 23

A state or phase changing from a vapor to a liquid.

Front 24

Define - condenser

Back 24

A heat exhanger, most often in the form of a coil or shell and tubes, used to reject heat from a refrigeration system while condensing refrigerant within its confines.

Front 25

Define - condenser pressure

Back 25

The head pressure produced in the condenser at saturated condition. The pressure is dependant on the entering air or condensor water temperature and the saturated refrigerant temperature.

Front 26

Define - convection

Back 26

Heat transfer through fluids by the movement of currents. The fluid becomes lighter and is affected by gravity.

Front 27

Define - counter flow

Back 27

Two fluids flowing near each other in opposite directions.

Front 28

Define - cross flow

Back 28

Two fluids flowing near each other at right angles to each other.

Front 29

Define - cross-sectional area

Back 29

The area of the cut surface of an object, cut at right angles to the length of the object

Front 30

Define - cycle

Back 30

One complete revolution or execution through a repeatable process.

Front 31

Define - Daltons law of partial pressures

Back 31

The total pressure of a mixture of gases is the sum of the individual pressures of each gas.

Front 32

Define - delta

Back 32

Based on the Greek symbol which is an isosceles triangle. Delta is used to identify a change or a difference in pressure or temperature.

Front 33

Define - density

Back 33

The ratio of mass to volume. The weight per unit volume of a substance.

Front 34

Define - dry bulb temperature

Back 34

The sensible temperature of the air determined with a dry thermometer.

Front 35

Define - energy

Back 35

The ability to perform work.

Front 36

Define - enthalpy

Back 36

The heat in one pound or kilogram of a substance from a zero base point and at - 40°f (f or c)

Front 37

Define - entropy

Back 37

A measurement of energy transfer where the energy is moved but not used to do work.

Front 38

Define - evaporation

Back 38

The process of a liquid changing to a vapor due to an addition of heat energy and a change in vapor pressure.

Front 39

Define - fahrenheit

Back 39

A temperature scale based on the fact that 0°was the temperature obtained by Gabriel Fahrenheit when he mixed snow and salt. The symbol is °F

Front 40

Define - fluid

Back 40

Any substance that is in a state that allows it to flow.

Front 41

Define - force

Back 41

The creator of motion or acceleration.

Front 42

Define - freezing

Back 42

A change of state of matter from a liquid to a solid.

Front 43

Define - gas

Back 43

An invisible state in which a substance attempts to fill its surrounding space : also called vapour.