Have you ever had a steaming cup of hot chocolate that’s just too hot to drink? The hot chocolate is giving off a lot of heat and trying to cool down by letting the heat escape into the air, but there’s just one problem. The hot chocolate has heated the air above the mug that contains it. A warm cushion of air above the mug won’t cool the hot chocolate as quickly as cold air.
There is a pretty simple solution! If we blow that cushion of warm air away, cool air will take its place and cool the hot chocolate faster. The air above the mug will soon get warm again, but then we just need to take another deep breath and blow it away!
Always be careful with hot drinks though. Sometimes they are just too hot to drink, and you don’t want to risk burning your mouth or your tongue.