system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does salt and ice make it colder, but at the same time when you put salt down on snow, it melts it faster?
gpt
Putting salt on ice doesn't make it colder or change the temperature of things at all. It only lowers the temperature required to make water a solid, which is why ice begins to turn back into water (it's not cold enough anymore).  
  
If you're wondering why you mix ice and salt when using things like an ice cream churn, it's because having 32 degree Fahrenheit (or less) water helps by creating more contact area with the ice cream tub. So by having literally ice cold water, it helps freeze the ice cream faster than having ice cubes stacked around it with minimal contact.