Calcium Phosphate Excipients - Innophos

Appendix
Units of Measurement
(from Scientific Tables, K. Diem and C. Lentner, eds., Ciba-Geigy Corp., Ardsley, NY 10502, 1970).
FORCE (F) (= mass x acceleration)
International System of Units: newton (N) = m kg s -2
ft-lb-s System: poundal (pdl) = ft Ib s -2 = 0.13825N
Conversion of noncoherent units of force (g n
= standard acceleration due to gravity = 9.80665 ms -2 =
32.174048 ft s-2)
1A unit= (b) B units (b in table)
A
B
Name Symbol Definition pdl N
pond p g n
x (1g) 7.09316 x 10 -2 9.80665 x 10 -3
gram-force
gf
pound-force lbf g n
x (1lb) 3.21740 x 10 4.44822
kilopond kp g n
x (1kg) 7.09316 x 10 9.80665
kilogram-force
kgf
short ton-force sh tonf g n
x (1sh tn) 6.43481 x 10 4 8.89644 x 10 3
long ton-force tonf g n
x (1ton) 7.20699 x 10 4 9.96402 x 10 3
10kN = 2250 lbf (pound force) = 1.12 tons (U.S.)
}
}
PRESSURE (p) (=force/area)
International System of Units: newton per square
meter (Nm -2 = m -1 kg s -2 (Nm -2 = Pascal (Pa))
ft-lb-s System: poundal per square foot
(pdl ft -2 ) = ft -1 Ib s -2 = 1.48816 Nm -2
Conversion of noncoherent units of pressure
1A unit = bB units (b in table)
Standard Deviation: (s.d. or s)
s.d. = √Σ(x i
- _ x) 2
n - 1
Coefficient of Variation: (c.v.) =
% relative standard deviation (%RSD)
c.v. = s.d. (100)
_
x
Porosity (∈): tablet void volume/tablet volume
Tablet Crushing Strength: Tablets should break across the diameter.
Crushing strength, commonly called tablet hardness, is measured in units of force.
1 kp = 1 kgf 1 kilopond = 1 kilogram-force
1kg = 1kgf ÷ gn 1 kilogram = 1 kilogram-force/acceleration due to gravity
1 S.C.U. = 1 Strong-Cobb Unit = 0.71 kiloponds
A
B
Name Symbol pdl ft -2 Nm -2
kilogram force per square meter kgf m -2 6.58976 9.80665
pound force per square inch lbf in -2 4.63306 x 10 3 6.89476 x 10 3
23