QUANTITY

NAME

UNIT

Dimensions

angle

degrees

°

2p rad = 360°

area

hectare

ha

1 ha = 10⁴ m²

density, r

1 kg.m^-3 = 10^-3 g.cm^-3

distance

kilometre

mile

nautical mile

parsec

astronomical unit

km

mi

nmile

pc

ua

1 km = 1000 m

1 mi = 1609 m

1 nmile - 1852 m

1 pc = 3.0857x10¹⁶ m

1 ua = 1.496x10¹¹ m

energy

electron volt

kilowatt hour

calorie

Calorie

eV

kWh

cal

Cal (kcal)

1 eV = 1.602x10^-19 J

1 kWh = 3.6x10⁶ J

1 cal = 4.19 J

1 Cal = 4190 J

magnetism

1 T = 1 Wb.m^-2

1 T = 10⁴ gauss

mass, m or M

metric tonne

unified atomic mass

T

u

1 t = 1000 kg

1 u = 1.661x10^-27 kg

pressure, P

millibar

hectopascal

atmosphere

mercury

mbar

hPa

atm

mmHg

1 mbar = 100 Pa

1 Pa = 100 Pa

1 atm = 1.013x10⁵ Pa

1 mmHg = 1.333x10² Pa

temperature, T

 celsius

°C

D T = 1 °C = 1 K

T(°C) = T(K) - 273.15

time, t or T

minute

hour

day

year

min

h

d

y

60 s

3600 s

86 400 s

3.1536x10⁷ s

velocity, speed

knot

km.h^-1

kn

1 km.h^-1 = (1/3.6) m.s^-1

1 kn = 0.514 m.s^-1

volume

 litre

millilitre

L

mL

1 L = 10^-3 m³

1 mL = 1 cm³ = 1x10^-6 m³