Conversion Tables for Units
Chapter 1
-
4
Name Symbol Relation to SI
acceleration, a
SI unit m s
-2
standard acceleration of g
n
= 9.806 65 m s
-2
free fall
gal, galileo Gal = 10
-2
m s
-2
force, F
newton (SI unit)
3
N = kg m s
-2
dyne (cgs unit) dyn = g cm s
-2
= 10
-5
N
au of force E
h
/a
0
≈
8.238 73
×
10
-8
N
kilogram-force kgf = 9.806 65 N
energy, U
joule (SI unit) J = kg m
2
s
-2
erg (cgs unit) erg = g cm
2
s
-2
= 10
-7
J
rydberg Ry = E
h
/2
≈
2.179 87
×
10
-18
J
electronvolt eV = e
×
V
≈
1.602 18
×
10
-19
J
calorie, thermochemical cal
th
= 4.184 J
calorie, international cal
IT
= 4.1868 J
15
°
C calorie cal
15
≈
4.1855 J
litre atmosphere l atm = 101.325 J
British thermal unit Btu = 1055.06 J
pressure, p
pascal (SI unit) Pa = N m
-2
= kg m
-1
s
-2
atmosphere atm = 101 325 Pa
bar bar = 10
5
Pa
torr Torr = (101 325/760) Pa
≈
133.322 Pa
millimetre of mercury mmHg = 13.5951
×
980.665
×
10
-2
Pa
≈
133.322 Pa
(conventional)
pounds per squere inch psi
≈
6.894 757
×
10
3
Pa
power, P
watt (SI unit) W = kg m
2
s
-3
horse power hp = 745.7 W
(3) 1 N is approximately the force exerted by the earth upon an apple.
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