PHC230H1 Lecture Notes - Lecture 7: Surface Tension, Lotion, Capillary Action
30 Apr 2016
School
Course
Professor
Document Summary
Pharmaceutics phm141h problem set 3: at 25 c, it takes 40 seconds for a volume of water with a density of 1 g/cm 3 to flow through a capillary viscometer. On the other hand, an equal volume of a glycerin solution in water with a density of 1. 12 g/cm3 flows through the same viscometer in 614 seconds. What are the absolute and relative viscosities of this solution. The viscosity of water at 25 c is 1 cp. Given: at t = 25oc = 298. 15 k; W = 1 g cm-3, tw = 40 s, w = 1 cp. = 1. 12 g cm-3, t = 614 s. R= / w = t /tw w = (614 s)(1. 12 g cm-3)/[(40 s)(1 g cm-3)/] R = / w = r w = 17. 2*(1 cp) Given: = 1. 008 g cm-3, r = 0. 02 cm, h = 6. 60 cm, g = 9. 81 m s-2 = 981 cm s-2.
