Biomedical Engineering Reference
In-Depth Information
Table 8.4.
Fundamental physical constants
Constant
Value
Unit
Symbol
6.022
×
10
23
mol
−1
Avogadro constant
N
A
;L
10
−19
Elementary charge
1.602176
×
C
e
J
×
mol
−1
×
K
−1
Molar gas constant
8.3145
R
10
−11
m
3
kg
−1
s
−2
Newtonian constant
6.673
×
×
×
G
of gravitation
Table 8.5.
Conversion factors into SI units
Unit
Symbol
Conversion to SI unit
=
Ångström unit
Å
1 Å
0.1 nm
=
Atmospheres (physical)
atm
1 atm
101.325 kPa
=
Atmospheres (technical)
at
1 at
98.066 kPa
=
Bar
bar
1 bar
100 kPa
=
Calorie
cal
1 cal
4.1868 J
=
Centimeter of water
cm H
2
O1cm H
2
O
98.07 Pa
=
Curie
Ci
1 Ci
37 GBq
Degree centigrade (
◦
Celsius)
◦
C
x
◦
C
=
K − 273.15
◦
F
1
◦
F = 0.555
◦
C
x
◦
C
Degree Fahrenheit
=
/
(y
◦
F − 32)
1.8
=
(459.67 + y
◦
F)
/
x K
1.8
=
Desintegrations per minute
dpm
1 dpm
0.0167 Bq
=
10
−19
J
Electron volt
eV
1 eV
1.60202
×
=
10
−7
J
Erg
erg
1 erg
=
Foot
ft
1 ft
0.3048 m
γ
γ=
µ
Gamma
1
1
g
=
Grain
gr
1 gr
64.799 mg
=
Inch
in
1 in
25.4 mm
=
International Unit
IU
1 IU
16.67 nkat
(enzyme activity)
Kilopond
=
kp
1 kp
9.80665 N
Kilopond/cm
2
/
cm
2
/
cm
2
=
10
3
Pa
×
kp
1 kp
98.066
=
Millimeter of mercury
mm Hg
1 mmHg
133.32 Pa
=
Pound
lb
1 lb
0.4536 kg
=
6.8948
×
10
3
Pa
Pound per square inch
psi
1 psi
=
To r r
To r r
1 Torr
133.32 Pa
