system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does 16 degree Celsius ocean water feel a hell of a lot colder than 16 degree Celsius air?

Just wondering.  Today the air temp was the same as the water temp, but jeeezus, the water felt a lot colder.  I know there's something about water taking your body temperature away a lot faster than air, but I can't explain why.
gpt
Well, Timmy (that's what the "t" in taitabo stands for, right?), imagine that there are two hills that you want to ride your tricycle on. Now, you know that on a hill that gets higher a lot faster, your tricycle will speed up more and more as you ride down it! So there are two hills: one hill is reeeeaaaalllllllllllly steep; that means that your tricycle will go reeeeaaaalllllly fast when you ride down it! The other hill isn't very steep at all; your tricycle will go really slowly, the perfect ride for a 3-year old, but that's not you, Timmy, you're an awesome 5-year old ready to ride fast! If you ride the steep hill, you'll go really fast! If you ride the not-so-steep hill, you'll go really slow!

Now imagine that riding down the steep hill is like jumping into cold water. Instead of moving really fast, you're going to get cold really fast! The steepness is like something adults like to call "thermal conductance" and "convection" and other fancy sounding words!

And riding on the not-so-steep hill? That's like stepping outside! Sure, you'll get cold eventually, but not as fast as the steep hill!