Interesting experiment

After plugging in an iceberg, the coin suddenly vibrated violently. Why?

Recently, netizens around the world are spreading a very interesting physics experiment: a ghost coin.

Specifically, the man just plugs a coin into an iceberg, the coin suddenly vibrates, trembling as if seeing ghosts.

Why is that?

Actually this is not normal ice, but dry ice - dry ice .

CO2 is sure everyone knows, because it is so popular. This gas will solidify when it reaches about -78.5 degrees Celsius, forming the substance we call dry ice.

However, CO2 is one of the rare substances that does not have a liquid form (actually, but is only created under conditions 5 times higher than atmospheric pressure).

This means that under normal pressure conditions, CO2 will shift straight from the gas into solid crystals when the temperature is low, then " sublimation " into gas when the temperature rises.

And with such a terrible low solidification temperature , the coin's temperature will surely be much higher. As a result, when the coin touches, the exposed stone area will quickly sublimate, causing the pressure to change.

After a period of time, the surface of the ice sheet will appear a large enough space to help the air flow more and more powerful. In the end as we saw, the coin trembled like a ghost.

Note when using dry ice

Basically, dry ice is a relatively safe substance, because this gas when sublimation does not cause toxicity. However, CO2 is not a life-sustaining gas. So if you work with a large amount of dry ice, you may be shocked by lack of oxygen, causing unconsciousness, or even death if not timely help.

Also, because the temperature of dry ice is very low, you should avoid having your skin in direct contact with it.