Salty Science

The Western Star - - KID SCOOP -

Most of the ocean doesn’t freeze. Why? Salt wa­ter freezes at a lower tem­per­a­ture than fresh wa­ter.

1. Soak your thread in some wa­ter then lay it on top of an ice cube.

2. Sprin­kle a tiny bit of salt along the thread and wait about 30 sec­onds.

3. Lift the thread. Does the ice cube cling to the thread and get lifted as well?

Ex­pla­na­tion: The salt melts the sur­face of the ice. The cold­ness of the ice then re­freezes this wa­ter, trap­ping the thread and freez­ing it to the ice.

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