This section is from the book "Applied Science For Metal Workers", by William H. Dooley. Also available from Amazon: Applied Science For Metal Workers.
When steam is generated under ordinary conditions it is termed "steam of one atmosphere" (15 lbs. per square inch). One cu. in. of water will produce approximately 1 cu. ft. of steam (1728 cu. in.). If the pressure is increased the volume is diminished; i.e., the pressure varies inversely as the volume. Thus with a pressure of 30 lbs. the volume is only one-half of what it would be under normal pressure. One cu. in. of water produces 864 cu. in. of steam under 30 lbs. pressure.
P : P' = V' : V 15 : 30 = V : 1728 30 V ' = 15 X 1728
V' = 15 X 1728 / 30
V' = 864 cu. in.
 
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