Sedimentation, electrophoresis
Sedimentation, electrophoresis
Sedimentation, electrophoresis
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F upthrust = ρ mVg<br />
ρρ km<br />
<br />
<br />
<br />
m, ρ<br />
v<br />
<br />
<br />
F g= mg<br />
<strong>Sedimentation</strong> in a gravity field<br />
F frict= fv<br />
<br />
<br />
<br />
<br />
F = F +<br />
g<br />
upthrust<br />
F<br />
frict<br />
ρVg<br />
− ρm<br />
Vg =<br />
spherical<br />
particle<br />
to calculate<br />
v<br />
to measure<br />
V = 4<br />
sed<br />
fv<br />
F − F =<br />
g<br />
upthrust<br />
F<br />
frict<br />
v = constant<br />
3 r3π Ffrict = 6πη0rv<br />
=<br />
(η 0: viscosity of the medium)<br />
2r<br />
ρ m: density of the medium; m: mass, ρ: density, v: velocity of the moving spherical particle<br />
2<br />
( − ρ )<br />
ρ m g<br />
9η<br />
0
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