function gasDensity (form) {

//get information from form
var pressure = form.pressure.value
var temp = form.temperature.value
var MW = form.MW.value
var z = form.z.value

pressure = parseFloat(pressure)
temp = parseFloat(temp)
MW = parseFloat(MW)
z = parseFloat(z)


//calculate density

var R = 10.73
var pressureAbsolute = pressure +14.7
var temperatureAbsoulute = temp + 460

var den = (MW*pressureAbsolute)/(z*R*temperatureAbsoulute)
var specVol = 1/den

den = den*1000
den = Math.round(den)
den = den/1000

specVol = specVol*1000
specVol = Math.round(specVol)
specVol = specVol/1000


form.density.value = den
form.specificVol.value = specVol


}

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