Hey guys, I'm an aircraft maintenance apprentice and I've been wondering about the air that is squeezed through a carburetor vs the carb heat air that is put through the carburetor to prevent icing. The air going through the venturi of the carburetor increases in velocity, lowers in density and is very cool. The hot air that is used for carb heat is very warm but is also low density. My question is how can they both be low density and vastly different temperatures, is it the velocity of the air that makes it cool or warm? Sorry if this is really basic kinda stuff, it's just been confusing me for a little while and I'd be grateful for someone to clear this up for me.