Saturday 16 August 2014

SI Units and Symbols used in the THERMODYNAMIC


SI Units and Symbols used in the Guide

Subject
Physical Quantity
Symbol
Name
Unit
Mechanics
Mass
m, M
kilogram
kg
Linear position
Length, Distance
Radius
x, r
 l, d
R
meter
m
Time
t, 
second
s
Linear angle,
Angular position
radian
rad
Spherical angle
steradian
sr
Area
A
-
m2
Volume
V
-
m3
Moment of inertia
I
-
kg*m2
Density
-
kg/m3
Linear velocity
v, u, c
-
m/s
Angular velocity
-
rad/s
Linear momentum
p
-
kg*m/s
Angular momentum
L
-
kg*m2/s
Linear acceleration
a
-
m/s2
Angular acceleration
-
rad/s2
Force
F
newton
N=kg*m/s2
Torque
-
N*m
Impulse
I
-
N*s
Work
Energy
W
E
joule
J=N*m
Power
P
watt
W=J/s
Dynamic viscosity
-
Pa*s
Electricity and Magnetism

Current
I
ampere
A
Charge
Q, q, e
coulomb
C=A*s
Current density
j
-
A/m2
Volume charge density
-
C/m3
Surface charge density
-
C/m2
Linear charge density
-
C/m
Electric potential
Voltage
emf
V
volt
V=J/C
Electric field
E
-
N/C, V/m
Electric flux
-
V*m
Electric moment
pe
-
C*m
Resistance
R, r
ohm
=V/A
Specific resistance
-
*m
Capacitance
C
farad
F=C/V
Specific conductivity
-
(*m)-1
Magnetic field
B
tesla
T=N/(A*m)
Magnetic flux
weber
Wb=T*m2=V*s
Inductance
Mutual-inductance
L
M
henri
H=Wb/A
Magnetic moment
pm
-
A*m2
Polarization
P
-
C/m2
Magnetization
I
-
A/m
Thermodynamics
Temperature
T
kelvin
K
Substance quantity
M
mole
mol
Pressure
P
-
Pa
Heat
Q
-
J
Heat capacity
Entropy
C
S
-
J/K
Specific heat
c
-
J/(kg*K)
Molar heat
cm
-
J/(mol*K)
energy flux
j
-
W/m2
Surface tension
-
N/m
Stress
Elasticity modulus
E
pascal
Pa=N/m2
Oscillations and Waves

Wavelength
-
m
Wave number
k
-
m-1
Frequency
f
hertz
Hz
Energy density
-
J/m3
Energy flux
J
-
J/m2
Intensity
I
-
J/(m2*s)
Reactance
Impedance
X
Z
ohm
=V/A
Optics

Focal length
f
-
m
Luminous intensity
I
candela
cd
Luminous flux
lumen
lm=cd*m2
Illuminance
E
lux
lk=lm/m2
Brightness
L
-
cd/m2
Linear absorption coefficient
-
m-1
Quantum Physics
Mass absorption coefficient
-
m2/kg
Radioactive activity
A
becquerel
Bq=s-1
Absorbed dose
D
gray
Gy=J/kg


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