How Salt Melts Ice

Materials & Equipment:

Water, salt, 2 pie pans, a freezer

Procedure:

Setup

Setup

Fill each pan with water to about 2/3’s capacity. Place the pans on your freezer shelf, then wait for the water to freeze. After the water has turned to ice, set your pans side by side, and choose one to sprinkle with sea salt.

Results:

The salted ice will begin melting immediately. This is very similar to the way that our cities brine roads in anticipation of a snow or ice event. The science behind this method? Salt lowers the freezing (and also melting) point of water; therefore, the outside temperature must decrease significantly in order to maintain the salted ice.

Results - Salted Ice

Results – Salted Ice

Results - No Salt Added

Results – No Salt Added