system
Given the following post, respond as if you're commenting on Reddit:
human
Why does holding ice over salt on your skin cause a burn?

I remember doing this as a child out of curiosity, but what causes the burn?
gpt
Salt lowers the freezing point of water.  Normally when you put ice on your skin, it stays at 32F, since when something is changing state it stays at the temp until all of it has changed.  When you put salt on it, the water can get way colder than 32F, meaning you can get a "burn" though when you say burn you really mean damage from the cold.