142
Tab. 15.1
SYMBOLS AND UNITS OF MEASUREMENT
SYMBOL UNIT OF MEASUREMENT DESCRIPTION EXAMPLE
α degree Rotation/inclination angle 1°
cm
2
square centimetre Area 1 cm
2
Ø millimetre Circumference Ø 1 mm
Nm newton-metre Torque 1 Nm
mm millimetre
Dimension
1 mm
μm
1/1000 of a millimetre
(micron)
1 μm
h hour
Quantity
1 h
g/kWh
grammes per kilowatt per
hour
1 g/kWh
kg/h kilogramme per hour 1 kg/h
L/min. litres per minute 1 L/min.
L/h litres per hour 1 L/h
ppm parts per million 1 ppm
N newton Force 1 N
A Ampere Intensity of electrical current 1 A
gr. gramme
Weight
1 gr.
kg kilogramme 1 kg
W Watt
Power
1 W
kW kiloWatt 1 kW
pa pascal
Pressure
1 pa
KPa Kilopascal 1 KPa
bar barometric pressure 1 bar
mbar (1/1000 bar) barometric pressure 1 mbar
R Resistance
Resistance to electrical
current (referred to a compo-
nent)
1 Ω
Ω ohm
Resistance of electrical cur-
rent
1 Ω
Rpm revs per minute Rotation of an axis 1 Rpm
Ra
average roughness ex-
pressed in microns
Roughness Ra = 1
°C degree centigrade Temperature 1°C
V Volt Electrical voltage 1 V
Ã
millimetre Hex-head capscrew
à 1 mm
cm
3
cubic centimetre
Volume
1 cm
3
L litre 1 L