Thermodynamics (Properties of Working Substance) Flashcards

(48 cards)

1
Q

study of heat and work and those properties of substances that bear a relation to heat and work.

A

Thermodynamics

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2
Q

derived from Greek words theme, meaning “heat” an dynamics, meaning “strength” particularly applied to motion.

A

Thermodynamics

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3
Q

a substance to which heat can be stored and from which heat can be extracted.

A

Working Substance

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4
Q

a working substance whose chemical composition remains the same even if there is change in phase.

A

Pure substance

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5
Q

a working substance which remains in gaseous state during its operating cycle and whose equation of state is PV=mRT

A

Ideal gas

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6
Q

is the force per unit area. It may be described as a measure of the intensity force.

A

Pressure

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7
Q

pressure exerts by air as it has mass that is subjected to the action of the gravity.

A

Atmospheric Pressure

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8
Q

are instruments used to measure the pressure of the atmosphere.

A

Barometers

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9
Q

used to measure fluid pressure in a closed vessel.

A

Pressure gauges

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10
Q

Pressure gauges commonly used in the refrigeration industry are

A

Manometer and bourdon tube

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11
Q

type of gauge utilizes a column of liquid to measure the pressure, the height of the column indicating the magnitude of the pressure

A

Manometer

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12
Q

The liquid used in manometers is usually either

A

water or mercury

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13
Q

is understood to be the “total” or “true” pressure of a fluid

A

Absolute Pressure

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14
Q

is the pressure as indicated by a gage

A

Gage Pressure

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15
Q

is the pressure measured relative to absolute vacuum., that, absolute zero pressure

A

Absolute Pressure

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16
Q

is a pressure that is less than atmospheric pressure. It is also a negative pressure.

A

Vacuum Pressure

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17
Q

is the pressure measured relative to atmospheric pressure.

A

Gage pressure

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18
Q

a space that is devoid of matter, and in which the pressure is “zero”

A

Perfect Vacuum

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19
Q

is use to measure small and moderate pressure difference

A

Manometer

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20
Q

is commonly used mechanical pressure measurement device.

21
Q

is the degree of hotness or coldness of a substance or body

22
Q

measure the level of the thermal pressure of a body

23
Q

the most frequently used instrument for measuring temperature is

24
Q

measures the temperature of high-temperature gases

25
Heat will pass from one body to another when and only ______ exists between the two bodies
difference in temperature
26
maybe defined as the mass divided by the volume or reciprocal of specific volume.
Density
27
is the volume of a substance divided by its mass or reciprocal of density
Specific Volume
28
is the ratio of weight of an object to its volume.
Specific weight
29
Is the ratio of the density of any substance to the density of water which is known as the standard density
Specific Gravity
30
heat energy due to the movement of molecules within the brought about its temperature
Internal Energy
31
Constant Specific heat process
Internal Energy
32
also called molecular energy
Internal Energy
33
What is the sum of all of the microscopic forms of energy called?
Internal Energy
34
is the product of pressure and volume or specific volume
Flow Work
35
is the sum of internal energy and flow work. It is also a function of temperature
Enthalpy
36
is a measure of molecular disorder, or molecular randomness. As a system becomes more disordered, the positions of the molecules become less predictable and it increases
Entropy
37
is an extensive property of a system
Entropy
38
Occurs when a solid turns to a liquid.
Melting
39
occurs when a liquid turns to a solid.
Freezing or solidifying
40
occurs when a liquid turns to a gas
Vaporization
41
occurs when a gas (vapor) turns to a liquid
Condensation
42
Occurs when a solid turns to a gas
Sublimation
43
is simply a change in the system state
Process
44
is the point in which solid, liquid and vapor occur
Triple Point
45
heat energy that causes or accompanies a change in the temperature of a substance is called
Sensible heat
46
Heat energy that causes or accompanies a change in the phase of a substance is known as
Latent Heat
47
When the change occurs between the solid and liquid phases in either direction, the latent heat involved is known as
latent heat of fusion.
48
When the change occurs between the liquid and vapor phases in either direction, the latent heat involved is called
Latent heat of vaporization