Elementary Principles 34

# Elementary Principles 34 - 3.41(a P1 A g h1 h2 = P2 B gh1 C...

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3- 18 3.41 (a) Pg h h hg h AB C 11 2 2 1 2 ++ = + + ρρ ρ bg ⇒−= − + − P P gh gh BA CA 12 1 2 (b) P 1 121 10 0792 137 0792 = L N M + O Q P kPa + g 981 cm 30.0 cm cm s g 981 cm 24.0 cm cm s 32 .. . . b g × F H G I K J × F H G I K J dyne 1 g cm / s kPa 1.01325 10 dynes / cm 26 2 1 101325 . = 1230 . kP a 3.42 (a) Say t (g/cm 3 ) = density of toluene, m (g/cm 3 ) = density of manometer fluid (i) Hg: cm cm (ii) H O: cm 2 tm m t gh R g R R h hR () ., . , . . , 500 500 1 0866 136 150 238 100 150 2260 cm −+ = ⇒ = == = = = = Use mercury, because the water manometer would have to be too tall. (b) If the manometer were simply filled with toluene, the level in the glass tube would be at the level in the tank. Advantages of using mercury: smaller manometer; less evaporation. (c) The nitrogen blanket is used to avoid contact between toluene and atmospheric oxygen,
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## This note was uploaded on 02/27/2012 for the course CHEMICAL E 312 taught by Professor Cheung during the Fall '11 term at The University of Akron.

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