Hello everyone. New guy, first post. I typically frequent gasoline engine performance forums, but my inquisitive nature has led me beyond the scope of general knowledge available within that format. I appreciate any help in figuring out the following. Thank you in advance! If 100 cubic feet of air at sea level (about 15psia) is 70°F and is compressed to 60psig (75psia), what is the resultant volume and temperature? (assuming no outside losses or gains) If the temperature of the compressed air is reduced to the original temp of 70°, but the pressure of 60psig is maintained, what is the new volume? Lastly, if the air, compressed to 60psig @ 70°F, is decompressed to 15psig (30psia), what is it's resultant temperature? Recap: Air at 70°F - Compressed 60psi over ambient- cooled - decompressed to 15psi over ambient... What's the new temp? A ton of thanks to any input!