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geek learn science

How does salt melt ice?


Well it ain’t. It does not melt ice. Salt is just moving the melting point below 0 degrees Celsius and thus you will see water becoming liquid when salt comes into play.

The way ice make water liquid is by injecting the sodium and chlorine ions between the water molecules in the ice breaking it apart. If I may, I’d name this ice crunching or ice braking, but not ice melting.

Anyways, salt helps only if the temperatures are -7 degrees or above. Below that temperature you need to use some other substance like potassium acetate or magnesium chloride. Salt and these other ice breaking substances aren’t doing any good to the environment so we need to take great care when using and then disposing of it.

Categories
geek learn science

How to make water instantly freeze. Tips and tricks from King of Random


In the video from above King of Random shows how he obtained a bottle of water that can be instantly turned into ice when it receives a nudge. For this you need to use purified water, put it in the freezer at -15 degrees Celsius and then wait for 2 hours.

After this you will be able to take the bottle out and you will still the water in a liquid form in there. When you hit the bottle a bit, then the magic will happen: the water will instantly become ice.

Why did the water become ice instantly? Because it was supercooled, meaning that it was cooled way below water’s freezing point. Since pure water does not easily form ice at or under 0 degrees Celsius it needs some irregularities in it (the nudge you give it) or a center of concentration, like a bacterium or grain of sand or any other object around which the ice will form.

In regards to ice, every snowflake will definitively have a bacterium, cell, grain of sand or the like that was used as a starting point for that icy flake to form. Ice doesn’t form without some help.

I’d suggest you also follow SuperCool from Radiolab to learn more about water that turns instantly into ice.

For tips and tricks on how to do this best check the next video:

Categories
entertainment geek

Hot Nickel Ball on ice? What could go wrong?

YouTuber carsandwater does some interesting experiments form time to time and you can stare at the videos for minutes wondering how those experiments work. If you drop a hot Nickel ball on ice it will just cut through the ice faster that you would think it would.

It manages to go through half way of the ice and then it stops, but the water left behind is hot. Interesting experiment, but don’t try this at home. Is there any study somewhere which could state how fast could a hot ball go through the ice depending on size and temperature? That would be interesting.

Via [Mashable].