You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
method is indirect and needs<br />
Measuring Forces on Microscopic Particles<br />
1) a measurement of the velocity of the particle<br />
2) a measurement of the diameter of the particle<br />
formulas:<br />
and<br />
measurement of velocity :<br />
F 6 ¡ ¢ v 1 £<br />
v µ.F<br />
1.63 l/r<br />
f £ 2(1 ¤ f)<br />
with<br />
with<br />
v: velocity<br />
µ: mobility<br />
F: force<br />
¢<br />
: viscosity<br />
f : 0 (elastic recoils)<br />
l: free mean path<br />
r: radius<br />
with microscope scale und stop watch<br />
measurement of diameter (selection!):<br />
using Mie-light diffraction<br />
by a mechanic method<br />
by fotography
Change language