Due to this, I also included another calculator which finds boiling point temperature given the atmospheric pressure, according to formula. So we can have only the estimated results with this formula. Moreover, the gravitational acceleration depends on the geographical latitude, atmospheric pressure, and water vapor concentration. Of course, the actual air pressure doesn't follow the barometric formula as that with high altitude difference air temperature can not be considered permanent. We will mark the value relating to the air with index v and relating to the water with index h.īy equating and getting rid of the exponent, we will get Here we will use the barometric formula (we don't have any other anyway): Now we have to to establish the dependence of the altitude to the atmospheric pressure. specific heat of water vaporisation 2.310^6 J / kg from one point to another, lying on the line liquid-vapor equilibrium, we obtain the following equationĪctually, this is the desired dependence of the boiling temperature of the pressure. Where the specific volume can be expressed throughīy integrating the left part to and the right part from to i.e. Thus, Clapeyron equation takes the following form As a result, the state of the vapor can be described using the Mendeleev-Clapeyron equation.Īnd the specific volume of fluid can be neglected. change of the specific volume in the transitionĬlausius simplified the Clapeyron equation for the case of evaporation and sublimation by assuming that the vapor follows the ideal gas law and that the specific volume of the fluid is much smaller than that of the steam. the specific heat of the phase transition, which is numerically equal to the amount of heat received by a unit of mass for the phase transition. This phase transition is described by the Clapeyron equation: All rights reserved.Determination of the boiling point involves two stages: establishing the dependence of atmospheric pressure on altitude and the dependence of boiling point on pressure.īoiling is a phase transition of the first order, in which water changes its physical state from liquid to gas. Report inappropriate or miscategorized file (requires an account or you may email us directly) Write a review for this file (requires a free account) In each case the expression has units J m -3 K -1 Pa K -1. The vapor pressure calculator helps you learn about phase transition, latent heat, the Clausius-Clapeyron equation and other. L and V are both specific (J/kg and m 3 /kg), or both molar (J/mol and m 3 /mol), or both extensive (J and m 3 ). Questions, comments, and problems regarding the file itself should be sent directly to the author(s) listed above. It doesn't matter as long as you are consistent, i.e. ***Version updated to 2.2.3*** (file name not representative of version #) -Fixed syntax error when choosing Fahrenheit as units when solving for pressure or temperature -Fixed partially missing equation at top of screen for all "solve for" functions -Added a Ti-84+ friendly version to the file folderĪngelo DeSanto ( Plus C Silver Edition/CE BASIC Science Programs Very easy to use as the program accepts three pressure units (atm, mmHg, & torr), as well as three temperature units (C,K,&F) and converts all of them automatically to an output of Kelvin, Atmospheres, or Kilojoules per mole, depending on the operation performed. If the enthalpy of vaporization is assumed constant over a temperature range, the equation can be integrated to give. In differential form, the CC equation can be written, where is the standard molar enthalpy of vaporization. Ranked as 3426 on our top downloads list for the past seven days with 2 downloads.Ī program to solve for any of three variables: Pressure, Temperature, or Heat of formation. Very easy to use as the program accepts three pressure units (atm, mmHg, & torr), as well as three temperature units (C,K,&F) and converts all of them. The ClausiusClapeyron equation determines the vapor pressure of a liquid as a function of temperature (in degrees K). Ranked as 26331 on our all-time top downloads list with 2127 downloads.
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