Brain Freeze: Brian Nevins’ Icy and Ice-Filled New England Waves
by Chris Dixon
According to NOAA, at least fifteen percent of the ocean is covered by sea ice during some part of the year about ten millions of the planet’s square miles. Because of its salt content, ocean water freezes at a colder temperature than fresh – about 28.4 degrees Fahrenheit. But – and I didn’t realize this – when salt water freezes, only the water freezes – not the salt. It precipitates back out into the unfrozen water. In fact, here’s a survival tip; there is so little salt in seawater ice that if you melted it, you could drink it safely. The more salt there is in water, the colder it needs to be to freeze. When water is completely saturated with all the salt it can hold (23.3% salt by weight), the freezing temp drops to -21.1 degrees celsius or -5.8 degrees fahrenheit. Talk about a brain freeze.