A recent discussion with a colleague left me looking for a formula to calculate the temperature of a given gas as a function of volume. I understand PV=nRT, but what if I only change the volume and want to calculate both the new temp and pressure? I expect there's an equation that relates specific heat, temperature and volume, but I haven't been able to find it with google (probably a bad choice of search terms), a little help? -Denny -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist