WHY DOES SALT MAKE A DIFFERENCE?

If you try to make you own slushy without salt then it’ll all go horribly wrong, the ice cubes will melt and you’ll be left with quite a lot of water but not a huge amount of slushy. You need the salt because water turns into ice when its temperature is 0°C or less, and the salt actually lowers the melting point of water, which in this case is the ice cubes around the bag of liquid we’re trying to turn into a slushy. The more inquisitive among you might ask why, and the answer is relatively straightforward. In pure water at 0°C, ice melts just as fast as water freezes. Adding the salt means that the melting point of water can drop to as low as -21°C, because energy…

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Gadget (Digital) - 1 Issue, Issue 12

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