Wk_1_recitation_F_04 - same system gage pressure...

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ENGRD/MAE 221 Thermodynamics F’04 Week 1 recitation problem An experiment requires measurements of a gas pressure of approximately 10 kPa gage, accurate to 0.1kPa. The use of a manometer is proposed. Water (density = 1000 kg/m^3) and mercury (density = 13560 kg/m^3) are under consideration for use as the manometer fluid. The atmospheric pressure at sea level is 101.325 kPa. a) For each fluid, calculate the height differences corresponding to the pressure differences of interest. On the basis of these numbers, which fluid would be the better choice for this experiment? What is the absolute pressure? b) How will these numbers change if the experiment takes place at an altitude of 1400m, with the
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Unformatted text preview: same system gage pressure (atmospheric pressure at 1400m is 85.6kPa)? c) What is the pressure range that can be measured by a water manometer 1m high? By a mercury manometer 1m high? Week 1 Important terms / concepts/ideas: System, system boundary, surroundings and universe Isolated, closed (control mass), and open (control volume) systems State, equilibrium, kinds of equilibrium and driving forces Property, extensive/intensive, pressure, temperature, specific volume Process - adiabatic process, quasi-equilibrium (quasi-static) process, isothermal process and Cycles Work Go over problem solving as outlined in book....
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This note was uploaded on 03/15/2010 for the course ENGRD 221 taught by Professor Staff during the Fall '08 term at Cornell University (Engineering School).

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