Geoscience Reference
In-Depth Information
Appendix 6
Units and symbols
Conversion factors
Time
10
3
10
4
1day
=
1.44
×
minutes (min)
=
8.64
×
seconds (s)
10
3
10
6
10
7
1year (a)
=
8.76
×
hours (h)
=
5.26
×
min
=
3.16
×
s
10
13
1Ma
=
3.16
×
s
10
3
10
9
1Ga
=
Ma
=
yr (a)
Length
1 metre (m)
=
100 cm
=
10
3
millimetres (mm)
=
10
6
micrometres (
m)
=
10
8
angstrom
units (Å)
1 kilometre (km)
=
10
3
m
1fathom
=
6ft
=
1.8288 m
1 nautical mile
=
1.852 km
60 nautical miles
=
1
◦
latitude
Area
1m
2
10
4
cm
2
=
1km
2
10
6
m
2
=
Volume
1m
3
=
10
3
litres
1km
3
=
10
12
litres
Velocity
1ms
−
1
=
3.6 km h
−
1
1kms
−
1
=
10
3
ms
−
1
=
3.6
×
10
3
km h
−
1
Angle
57.30
◦
=
57
◦
18
1 radian (rad)
=
1
◦
=
0.017 45 rad
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