PHC320H1 Lecture Notes - Lecture 32: Bulk Density, Aerosol, Void Ratio
24 Mar 2015
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Document Summary
Brownian motion, major mechanisms actually dependent on density as well so particle size is the independent variable physical ones we can measure by methods we learned but multiply by square root of density. True density=density of substance and volume is vs. Particle density=is volume of vs + volume of pore within particles so that is space inside particles which is interparticulate space within the particles so volume of a substance occupied. 1 dyne, then we get less active ingredient this all relates to bulkiness. Void volume is bulk volume-particle volume since space outside particles. Then we can use ratio which is called void or powder porosity but don"t confuse powder porosity with particle porosity they are different. Helium displacement method since helium particles are small, it can go through all kinds of pores, as small as 1 angstroms so two different types of pycnometeres we measure here is total space volume so void + pore volume.
