~ Substitue "R=287 J/(kg*K)" instead of "R=287 kJ/(kg*K)" and the units ~ will work out in the formula as originally posted. Gee, you guys are ~ sharp! ~ ~ Isn't it great??? This list is much more productive than a room full of engineers, and more fun. Who knows, one day there may be a official DIY_EFI conference (face-to-face)! - Bruce