| Autor: |
Osborne, N. S., Stimson, H. F., Fiock, E. F., Ginnings, D. C. |
| Zdroj: |
Journal of Fluids Engineering; January 1933, Vol. 55 Issue: 10 p51-66, 16p |
| Abstrakt: |
The method and apparatus employed, and the measurements made in this determination of the vapor pressure of water are described, and the results obtained are given and formulated. The method used was the “static method” in which the pressure is determined at the stationary boundary between the liquid and vapor phase in equilibrium at a constant temperature in a closed container. The container for the water sample was a calorimeter specially built for high-pressure work. Pressures were measured by a precision piston gage which balances the pressure by the gravitational force on a piston loaded with weights. Temperatures were measured by platinum-resistance thermometers supplemented by thermoelements. A total of 394 measurements were made at 38 temperatures so distributed as to facilitate formulation of the pressure-temperature relation. The formulation was made by using an empirical equation which was fitted to the results in two temperature ranges. Values of pressure and its derivative with respect to temperature are tabulated from this formulation in standard atmospheres, centibars, and kilograms per square centimeter at each degree centigrade, and in pounds per square inch at each degree fahrenheit. This provides a mutually consistent group of vapor-pressure tables in convenient form for practical working tables of fundamental steam data. It is estimated that the results are reliable to 3 parts in 10,000. |
| Databáze: |
Supplemental Index |
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