Physics Units outside the SI Unit

Name

Symbol

Value in SI units

minute (time)

min

1 min = 60 s

hour

h

1 h = 60 min = 3600 s

day

d

1 d = 24 h = 86 400 s

degree (angle)

°

1° = ( /180) rad

minute (angle)

1 = (1/60) ° = (/10 800) rad

second (angle)

1 = (1/60) = (/648 000) rad

Liter

L

1 L = 1 dm³ = 10^-3 m³

Metric ton 

t

1 t = 10³ kg

Electronvolt

eV

1 eV = 1.602 18 x 10^-19 J, approximately

unified atomic mass unit ^(e)

u

1 u = 1.660 54 x 10^-27 kg, approximately

astronomical unit ^(f)

au

1 au = 149 597 870 700 m, exactly

Name

Symbol   

Value in SI units

nautical mile

1 nautical mile = 1852 m

knot

1 nautical mile per hour = (1852/3600) m/s

are

a

1 a = 1 dam² = 10² m²

hectare 

ha

1 ha = 1 hm² = 10⁴ m²

bar

bar

1 bar = 0.1 MPa = 100 kPa = 1000 hPa = 10⁵ Pa

ångström

Å

1 Å = 0.1 nm = 10^-10 m

barn

b

1 b = 100 fm² = 10^-28 m²

curie

Ci

1 Ci = 3.7 x 10¹⁰ Bq

roentgen

R

1 R = 2.58 x 10^-4 C/kg

rad

rad

1 rad = 1 cGy = 10^-2 Gy

rem

rem

1 rem = 1 cSv = 10^-2 Sv