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> Because it is the empirical formula official why such they were begun to lead, you do not have to think deeply. The measured value of the saturated water vapor pressure, bane marie it may be found in the form of a numerical table in science such as chronology. bane marie However, because it is inconvenient all the time and just a few tables, it is useful to be inaccurate about a little, and can be calculated using the simple formula of saturated water vapor pressure. Then, saturated water vapor pressure is expressed as a function of the form E = E0 * 10 ^ (a * t / (b + t)) ...... that (A) First I "what if". Then, so as to reproduce the saturated vapor pressure that is measured to select the parameters E0, a, and b. As a result, when you select E0 = 6.11, a = 7.5, and b = 237.3, because it was found that this function is to reproduce the measured bane marie value, the formula used as (one of) the formula to determine the saturated vapor pressure now divided. bane marie So, the answer bane marie to the question "how are in such numbers why" is, will result in such numbers that, because well reproduces the measured value. In this way, I will say like "empirical formula" or "empirical formula", that of expression that is determined so as to reproduce well the measured value. The meaning of the parameters, there is also when you can, while others with no choice but to be considered too deeply. In this expression, there is a clear sense that the saturated water vapor pressure at the time of the 6.11hPa 0 to E0. In contrast, the parameters a, for b, we are able to associate heat of vaporization of water (molar enthalpy bane marie of vaporization) as shown below, but can be quite involved. Clausius slope dE / dt of the vapor pressure curve, using the - Clapeyron equation, you can associate with the heat of vaporization L. Omit the expression of the way because it is complicated, bane marie but I can use the expression of ANo.1 of Q & A Reference URL (2), the functional form of the vapor pressure curve is E = E0 * 10 ^ (a * t / (b When the + t)), heat of vaporization of L t is given L = a * b * 2.303 * 8.314 * ((t +273.15) / (t + b)) ^ 2 J / mol ...... in (B) It is possible to show that. In this equation, and substituting a = 7.5, b = 237.3, the t = 25, and in good agreement with the value that has become a L = 44 kJ / mol, was obtained from other experiments. Please note that, unlike the formula (A), expression of obtaining the heat of vaporization L (B) is that, not the empirical formula. bane marie Equation (B), you can also read "parameter a which is determined by some experiments, connecting the L which is determined by a separate experiment and b, equation theoretical" and, and the heat of vaporization L from "vapor bane marie pressure curve You can also read the theoretical formula "to determine. Normally, the derivation of the official's become important is, Are You a relational expression theoretical. Why empirical formula is for, whether you are such a form, I think be a problem very interesting, but to settle to the conclusion that "is in the form such eventually a variety of factors intertwined" I think so often, that it might be of may not have to think too deeply.
I became very helpful. I'll remember the expression to be converted bane marie to absolute temperature. Thank you very much.
For the formula of Clapeyron What Image 4 vapor pressure of saturated vapor pressure relationship of saturated water vapor and the amount of pressure bane marie - Clausius? Please tell me the conversion formula to calculate the absolute humidity than absolute temperature and relative humidity Method 7 to calculate the relative humidity from dew point temperature and six absolute temperature water vapor partial pressure of saturated water vapor pressure not a 5 atmospheric pressure. bane marie Please tell me the formula for calculating the absolute humidity [] from [relative humidity] and [8] dry-bulb temperature. Please tell me the basic equations of heat exchange 9. Is displayed and the like 2.43E-19 When calculated bane marie in Excel 10. What is E? There is a sign you do not understand the amount of saturated water vapor 12, of 13 exp Determination of relative humidity Are you sure you want this is a method of determining the relative humidity 11. I know the difference of 15 understanding that want to find a formula relative humidity from the value of the 14 temperature and humidity meter? Ln the latent heat of vaporization 19 wet-bulb temperature and 20 log 18 formula heat of vaporization of the evaporation rate of water formula 17 of 16 relative humidity bane marie
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