Yet another update to the Tools for Petrologists page this week with the Glass Density Calc tool. This Excel spreadsheet allows you to input the composition of your silicate glass in terms of oxide wt% in addition to the water content in wt% plus the temperature and pressure of your sample and outputs the density of your melt in terms of g/cm3 and g/L.
All of the constants and equations necessary from this tool come from Lange and Carmichael (1990) and Ochs and Lange (1999). The equations are put to further use (and some interesting relationships with viscosity are explored) in Hack and Thompson (2011).
User inputs are in the blue boxes, calculated outputs are in the red.