Symbols and S.I. units
Conversion table
S ym bo l
D e s c r ip tio n
U n it
S ym bo l
D e s c r ip tio n
U n it
a
d
f
k
km
m
n
t
v
B
E
F
H
I
J
linear acceleration
linear displacement
frequenc y
torque constant
motor constant
ma s s
rotational speed
time
linea r s peed
magnetic induction
electromotive force
forc e
magnetic field
c urrent
moment of inertia
m/s 2
m
Hz
Nm/A
Nm/ W
kg
rpm
s
m/s
T
V
N
A/m
A
kgm 2
L
M
P
R
R th
T
U
W
α
η
θ
τ
Φ
ω
induc ta nc e
torque
po we r
resistance
thermal resistance
temperature
volta ge
work , energy
angular acceleration
efficiency
angular displacement
time constant
ma gnetic flux
angular speed
H
Nm
W
Ω
°C/W
°C
V
Nm
rad/s 2
–
rad
s
Wb
rad/s
Length:
1 in
1 ft
= 25.4
= 0.3048
mm
m
1 mm
1m
= 0.0393
= 3.281
in
ft
Mass:
1 oz
1 lb
= 0.0283
= 0.454
kg
kg
1 kg
1 kg
= 35.3
= 2.205
oz
Ib
Force:
1 kp
1 oz
1 Ib
= 9.81
= 0.278
= 4.45
N
N
N
1N
1N
1N
= 0.102
= 3.597
= 0.225
kp
oz
Ib
Temperature: T [ °F]
0K
= 9/5 T °C +32
= -273.15
°C
T [ °C]
0 °C
= 5/9 (T °F - 32)
= 273.15
K
Torque:
1 kpcm
1 oz-in
1 Ib-in
1 Ib-ft
=
=
=
=
0.0981
7.06
0.113
1.356
Nm
mNm
Nm
Nm
1 Nm
1 mNm
1 Nm
1 Nm
=
=
=
=
10.2
0.1416
8.849
0.7376
kpcm
oz-in
Ib-in
Ib-ft
Inertia:
1 gcm 2
1 oz-in 2
1 oz-in s 2
1 moiss
1 Ib-in 2
1 Ib-in s 2
=
=
=
=
=
=
1 x 10 -7
1.83 x 10
0.00706
7.06 x 10
0.000293
0.113
kgm2
kgm2
kgm 2
kgm2
kgm 2
kgm 2
1 kgm
1 kgm
1 kgm
1 kgm
1 kgm
1 kgm
=
=
=
=
=
=
1 x 10 7
5.46 x 10
141.6
141643
3418
8.85
Energy:
1 kcal
1 Btu
= 4187
= 1055
J
J
1J
1J
= 0.239
= 9.48 x 10
Power:
1 CV
1 HP
= 735
= 746
W
W
1 kW
1 kW
= 1.36
= 1.34
© Portescap
-5
-6
2
2
2
2
2
2
4
-4
gcm 2
oz-in 2
oz-in s 2
moiss
Ib-in 2
Ib-in s 2
cal
Btu
CV
HP