Applied Thermodynamics for Engineers by W. Ennis

By W. Ennis

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When a gas is compressed under a piston in a cylinder, the particles of the gas rebound from the inwardly moving piston with unchanged velocity relative to the piston, but with increased actual velocity, and the temperature of the gas consequently rises. When a gas is expanded under a receding piston, the particles of the gas rebound with diminished actual velocity, and the temperature falls" (9). Recent investigations iu molecular physics have led to a new terminology but in effect serve to verify and explain the kinetic theory.

6) Ewing: The Steam Engine, 1906. (7) Wormell, Thermodynamics. SYNOPSIS OF CHAPTER IV at constant volume; other capacities. Specific thermal capacities; at constant pressure, Atomic heat = specific heat X atomic weight; molecular heat. common gases are approximately equal. volumetric specific heats of The * Mean specific heat EegnauWs law = 77" T ; true specific heat = (JTT -; t aT real and apparent specific heats. 36 ; significance of R. 0055 B. t. u. for E all gases. /, J?. Rankine's prediction of the value of k: Mayer s computation of the mechanical equiva1 lent of heat.

13. A receiver holds 10 square inch. What Ib. of oxygen at 20 C. and under 200 Ib. pressure per it hold at 100 F. and atmospheric pressure ? weight of air will For an oxy-hydrogen light, there are to be stored 25 Ib. of hydrogen and of oxygen. The pressures m the two tanks must not exceed 500 Ib. per Fhul their volumes. square inch at 110 F 14. 200 Ib. 15. 1 containing air at normal atmospheric pressure is exhausted until inch of mercury, the temperature remaining constant. "What per PROBLEMS cent of the weight of air has been removed ?

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