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What Will Happen If You Insert a Coin Into Dry Ice?

coin

Image credit: CQ Entertainment

Carbon dioxide (CO2) is generally known as a gas, however, when it goes to temperature below −78.5 °C (−109.3 °F), it exists as a solid. This process is called deposition, and goes from gas to solid directly. When temperature increases, the dry ice will sublime and goes back to gas status directly.

When you insert a coin into a block of dry ice, interesting thing happens: it generates a shrill screech as soon as the coin makes contact with the dry ice and it begins to vibrate, almost like the coin is shivering.

So why does this happen?

When the coin is placed into the block of dry ice, the warmth of the metal sublimates the dry ice and results in a change in pressure. When the gas pushes past the coin, the pressure leads to the shriek. After a while, the coin produces a larger hole in the dry ice, resulting in even larger air currents that push the coin around, making it to vibrate and appear to be shivering.

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