Safety-valve problem.—A safety valve is three inches in diameter; the lever is twenty-eight inches long from the point of suspension of the weight to the pivoted end of the lever; the valve pin is four inches from the pivot; the weight is twenty pounds. What is the greatest pressure of steam the valve will hold, leaving the weight of the valve and of the lever out of the question? [II. 409].
Thermal unit.—What is the heat unit or thermal unit? [II. 410].
Latent heat.—Is all the heat in steam or water shown by a thermometer? What is the latent heat of water? What is the latent heat of steam? [II. 410].
Sensible heat.—What is the sensible heat of steam? [II. 410].
Total heat.—What is the total heat of steam? [II. 410].
Heaviest water.—At what temperature is water at its greatest density? What is the weight of a cubic foot of water when at its maximum density? [II. 410].
Heat of boiling water.—What determines the temperature at which water will boil? [II. 410].
Heat of steam.—Can steam be made hotter than the water while they are in contact? What is superheated steam? [II. 410].
Absolute pressure.—What is meant by the absolute pressure of steam? [II. 411], [416].
Dry steam.—What is meant by dry steam? [II. 411].