
The Salt and Ice Challenge
When there is snow on your walk, you’ve probably reached for the bag of rock salt to start sprinkling it. Have you ever thought about how the process works? The salt dissolves into sodium and chloride ions, disrupting the bonds between the water molecules and causing the snow to melt. It essentially lowers the freezing point of water so that it doesn’t start to refreeze instantly. Take note of that: it lowers the freezing point. Now apply that science to the skin. An ice cube in your hand is a little painful to hold onto, but the salt and ice trend took this to a dangerous level. The idea was to sprinkle salt on the back of your arm and place an ice cube on it. Because the freezing point is lower, the ice will feel even colder on the skin, which can result in severe burns to the skin from the ice.