Basic Water Treatment, Third Edition

Appendix 4: SI Units and Basic Conversion Factors

SI BASE UNITS

Quantity/dimension

SI unit and symbol

Length

metre (m)

Mass

kilogram (kg)

Time

second (s)

Temperature

kelvin (K)

Electric current

ampere (A)

Amount of substance

moles (mol) (need also to specify associated atoms, molecules, or whatever)

Light intensity

candela (cd)

SOME SI-DERIVED UNITS WITH SPECIAL NAMES

Quantity/dimension

SI unit

Symbol

Dimensions

Force

newton

N

kg m/s 2

Pressure

pascal

Pa

N/m 2

Energy, work

joule

J

Nm

Power

watt

W

J/s

ADDITIONAL UNITS RELEVANT TO WATER TREATMENT

Unit

Symbol

Area

m 2

Concentration (of amount of substance)

mol/m 3

Density

kg/m 3

Surface tension

N/m

Velocity

m/s

Viscosity (dynamic)

Pa s

Viscosity (kinematic)

m 2/s

Volume

m 3

CONVERSION FACTORS

Mass

1kg = 2.2 lb

Length

1m = 3.208 ft

25.4 mm = 1 in

Volume

1 m 3 = 35.3ft 3

Liquid measure

1 m 3 = 220 imp. gal = 263.7 US gal

Force

1N = 0.225 lb f

Pressure

1 N/mm 2 = 145 lb f/in 2

1 Pa = 1 N/m 2 = 0.000145 lb f/in 2

Power

1 kW = 1.341 HP

Volume flows

1 m 3/s = 220.4 imp. gal/s = 19.04 Mgal/day

Energy

1J = 0.732 ft lb f

1 kJ = 0.948 Btu

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