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Physical units
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QuantityUnit
Abbrev.
Definition
Equivalence
1) Basic units - SI System
LENGTHMetre
m
.1m = 3.2808 foot = 39.37 inch
MASSKilogram
kg
.1 kg = 2.2046 pound
TIMESecond
s
..
TEMPERATUREKelvin / Celsius
°
1 °K = 1 °C0 °K = - 273.16 °C
1 °C = (°F-32) / 1.8
1 °F = 1.8 °C + 32
2) Derived units
CAPACITYLitre
l
1 l = 1 dm3.
FORCENewton
N
1 N = 1 m kg / s2 1 N = force producing an acceleration
of 1 m / s2 for a mass of 1 kg
ENERGYJoule
J
1 J = 1 N m1 Btu = 1'054.35 J
1 Cal = 4.184 J
1 Wh = 3'600 J
POWERWatt
W
1 W = 1 J / s1 W = 0.001342 hp
1 W = 1.162 kCal/h

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