Why Does Salt Make Ice Melt Faster?

Imagine ice crystals are like tiny magnets holding hands tightly. When you sprinkle salt on top, the salt particles sneak between them and break those handshakes. Because they cannot hold hands as well, the solid ice turns back into liquid water even if it is cold outside.

You might wonder why this works when the air is freezing. Normally, water freezes at 32°F (0°C). But once salt mixes with a little bit of melted ice, it creates a salty soup called brine. This brine likes to stay liquid down to much colder temperatures, maybe even -6°F (-21°C).

Melting takes energy. When the salt pulls ice apart, it uses up heat from the surroundings. This is why the bag of ice cream gets cold when you add rock salt. The salt steals the warmth to help break the ice structure.