system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does water burn skin at far lower temperatures than air does?

For example, a human can easily endure a 90 °C (198°F) sauna for 15 minutes. Whereas human skin will burn in just two seconds in just 65°C (150°F) water.

ELI5 please.
gpt
Because water is far more effective at transferring heat to you than air is. 

It's the same reason why if you put your hand in a 200C hot oven, it'll feel hot but won't burn you unless you hold it in there for quite a few seconds, but if you so much as brush one of the metal shelves you'll get an instant burn. Everything in there, the air, and the shelves are all at 200C but air is terrible at transferring heat and metal is very good at it. 

Another example is why at room temperature, a wooden spoon will feel warmer to you than a metal spoon in the same environment, because the metal pulls the heat *away* from you way more effectively. Your body interprets that as feeling colder, despite them logically being the same temperature to begin with. 

Air being so bad at transferring heat is why you have to put thermal compound on the bottom of a computer processor cooler, to fill those microscopic air gaps with something that can transfer heat a lot more effectively.