Symbols Flashcards

1
Q

P

A

Pressure

Pa, N/m^2, bar

Force per unit area

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2
Q

T

A

Temperature

K, *C

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3
Q

V

A

Volume

m^3

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4
Q

v

A

Specific volume

m^3 / kg

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5
Q

m

A

Mass

kg

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6
Q

n

A

Number of moles

mol

n = m/M where M is molar mass

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7
Q

ρ

A

Density

kg/m^3

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8
Q

U

A

Internal energy

J

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9
Q

u

A

Specific internal energy

J/kg

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10
Q

H

A

Enthalpy

J

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11
Q

h

A

Specific enthalpy

J/kg

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12
Q

S

A

Entropy

J/K

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13
Q

s

A

Specific entropy

J/kg.K

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14
Q

W

A

Work

J

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15
Q

w

A

Specific work

J/kg

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16
Q

Q

A

Heat transfer

J

17
Q

q

A

Specific heat transfer

J/kg

18
Q

R

A

Gas constant

J/molK

19
Q

γ

A

Adiabatic index (C_p/C_v)

Dimensionless

20
Q

C_p

A

Specific heat capacity at constant pressure

J/kgK

Heat to raise temp at constant pressure

21
Q

C_v

A

Specific heat capacity at constant volume

J/kgK

Heat to raise temp at constant volume

22
Q

Δ

A

Change in quantity

23
Q

m.

A

Mass flow rate

kg/s

24
Q

Q.

A

Heat transfer rate

W

25
Q

W.

A

Power (work rate)

W

26
Q

η

A

Efficiency

Dimensionless

27
Q

COP

A

Coefficient of performance

Dimensionless

28
Q

k

A

Thermal conductivity

W/mK

29
Q

h (for heat transfer)

A

Convection heat transfer coefficient

W/m^2 K

30
Q

σ

A

Stefan-Boltzmann constant

W/m^2K^4

31
Q

ϵ

A

Emissivity

Dimensionless