IDEAL GAS CONSTANT AND CONVERSION FACTORS

1 centipoise = 1 cp = 0.01 poise = 10 Pitscal seconds = I milli Pascal second 

Time Rate of Change of Energy with Time 

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In equation (18.1), E1 is the standard potential and is a constant that includes all other potentials, R is the ideal gas constant, T is the temperature, z is the charge carried by ion i to be measured and whose activity is a, F represents Faraday s constant and 2.303 is the logarithmic conversion factor. 

Why 24.45 as a conversion factor Using the ideal gas law and the ideal gas law constant, this value can be calculated. (Your instructor may wish to have you prove this )... 

Volumetric flow rates of different gases are often compared to equivalent volumes of air at standard atmospheric temperature and pressure. The ideal gas law works well when used to size fans or compressors. Unfortunately, the gas law relationship, PV/T = constant, is frequently applied to choked gas streams flowing at sonic velocity. A typical misapplication could then be the conversion to standard cubic feet per minute in sizing SRVs. Whether the flow is sonic or subsonic depends mainly on the backpressure on the SRV outlet. In the API calculations, this is taken into account by the backpressure correction factor. 

A"ab is the equilibrium constant for an equilibrium in which the number of moles change, and so will have the units of (concentration)". It is thus dependent on our choice of units. If for example AJb is expressed in units of concentration, for example, then A"Jb( ), where P is pressure units, is obtained (for ideal gases) by using the conversion factor from the ideal gas law, P = cJKT, A ab(I ) = -Kab(c) Similarly, to obtain AJb(A) where the units are mole fractions, we have Kab N) = A Jb(c) C total Eab P) Ptotal. These relations will be of importance when we consider standard states and various thermodynamic relations (see footnote pg. 271). 

If the compressibility factor of a gas is Z(p, T), the equation of state may be written pV/RT = Z. Show how this affects the equation for the distribution of the gas in a gravity field. From the differential equation for the distribution, show that if Z is greater than unity, the distribution is broader for the real gas than for the ideal gas and that the converse is true if Z is less than unity. If Z = 1 + Bp, where B is a function of temperature, integrate the equation and evaluate the constant of integration to obtain the explicit form of the distribution function. 

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