###### Maths - 2 -

Fonctions

© The scientific sentence. 2010

### Units

Multiples & submultiples

MultiplePrefixSymbol
103kiloK
106megaM
109gigaG
1012teraT
1015petaP
1018exaE
SubmultiplePrefixSymbol
10-3millim
10-6microµ
10-9nanon
10-12picop
10-15femtof
10-18atoa

Units
ConceptUnitSymbolBase Unit
ForcenewtonNkg m s-2
PressionpascalPakg m-1 s-2
EnergyjouleJkg m2 s-2
PowerwattWkg m2 s-3
Electrical chargecoulombCA s
Electrical PotentialvoltVkg m2 s-3 A-1
Electrical Resistance ohmΩkg m2 s-3 A-2
Capacity faradFkg-1 m-2 s4 A2
Magnetic FluxteslaTkg s-2 A-1

Conversions
Concept SI Unit AS UnitConversion
Lengthmpi, po1pi = 12 po
1po = 2,54 cm
Surfacem2pi2, po21m2 = 10.76 pi2
Volumem3pi3, po3, Gal.1Gal.US = 3.785 l
Masskglbm1 kg = 2.2 lbm
ForceNlbf1lbf = 4.45 N
PressionPaPsi1atm = 101.3 kPa = 14.7 Psi
= 760 mHg = 10.33 mH2O
EnergyJ, calBtu 1 cal = 4.18 J
1 Btu = 1.055 kJ
PowerWHP1 HP = 746 W

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