Law of steam

Postscript and (2012/10/01) fixed. Because it is one that you created specific gravity of steam in a very mistaken, I will delete the graph above. And in the daily life, the concept to say saturated vapor pressure does not exist. Any pressure at temperature t say p (t) and is is 1 atm, the water there is no means of pressure affecting the evaporation phenomenon evaporation phenomenon under atmospheric pressure. It is 1 atm all. The numerical specific gravity of steam values of the density is also a mistake. It said that a meaning to the expression of correction over the atmosphere of water vapor density over that.
In the sense of the water vapor pressure calculation formula, calculation basis is unknown, or I feel the need to fix a numerical but modification of the saturated water vapor pressure calculation formula. I thought as above the need for the correction. Calculated in this correction specific gravity of steam equation, with little error. Water vapor pressure at 100 is 1012.86 [h Pa], water vapor density to satisfy almost 7.41 [Kg / m ]. But the singularity "critical point" 374 , a large error in the number of 225 atmospheres. At 374 , the error is slightly larger in comparison to 211 atm water vapor pressure, density 902 [Kg / m ], and the 1 [ton / m ]. However, it is thought specific gravity of steam of as a calculation formula that can be satisfied with the nearly practical.
Expression of the second equation water vapor pressure modifications are common logarithm form. In the calculation of natural phenomena, natural logarithm form in many cases. Calculation of the natural constant because has a basic calculation was corrected once the vapor pressure calculation formula to match. I propose a (t) = 9.37e ^ (17.475 αt / (αt +1)) ^ [h Pa] p. close to the standard value 225 atm, density is 961.9 [Kg / m ] is also the critical point of t = 374 . In addition to the discussion on the basis of the calculation formula of the search in the IT for the saturated water vapor pressure, and came to the modification of the expression. In expressing a phenomenon in formula, specific gravity of steam always consider that dimension. That are largely unknown in the dimension specific gravity of steam formula of water vapor pressure and the like of this. So I thought that dimension as a "dimensional analysis."
Law of steam
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