I went swimming for the first time this season on Thursday, and I was reminded of a question that has plagued me for nearly ever. When standing or swimming in water at least as deep as I am tall (that is, deep enough so that my face is just above the water level) I’ve noticed that the air directly above the water seems thicker and hotter than normal air. This has made it very difficult for me to catch my breath after swimming long distance, etc. Also, it only seems to occur in pools (not lakes or rivers). Any explanations for this? Or am I just imagining it?
Cave Canem. Beware the Dog.