Vapor Pressure of Methane

by Carla Perla

Submitted : Spring 2010

The objective of this project is to estimate the vapor pressures of methane at any given temperature and pressure using thermodynamic equations, physical constants for methane and the universal gas constant. The thermodynamic equations are the Claperon equation, and the Watson equation. The physical constants are critical temperatures, critical pressure, triple point temperature, normal boiling temperature, and the latent heat of vapoization. The calculated vapor pressures are compared with accurate measured values from the National Institute of Standards and Technology. A first order Euler numerical integration was employed or the necessary integrations. Three different temperature steps were tested in these integrations. Based upon calculated residuals, the middle-sized step led to the best representation of the NIST data.

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