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Why is solid CO2 called dry ice ?

Dry ice is basically solidified carbon dioxide, and is called so because the gas on solidifying gives an appearance similar to that of ice. Unlike ordinary ice, it does not melt into a liquid but changes directly into CO2 gas, a phenomenon known as sublimation. It changes into gaseous state at and above -78.5 degree Celsius. As this temperature is much lower than water, it is much colder than water ice. Its density varies from 1.2 - 1.6 g / cm3. It is therefore denser than water.

It is mainly used as a cooling agent because it has temperature lower than that of water ice. It is used for preserving frozen foods, ice cream etc.
Physical change are those changes which can be reversed.
Carbono dioxide is cooled until it turns into solid 'dry ice' which is used for refrigeration. (By changing temperature carbon dioxide can be recollected). 
So it's a physical change. 

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Dry ice is the common name for the solid form of carbon dioxide.

It's called dry ice because it doesn't melt into a wet liquid. Dry ice sublimates, which means it goes from its solid form directly to its gaseous form.

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Thanku 4 ur answer !

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Solid CO2 gets converted directly to gaseous state on decrease of pressure to 1 atmosphere without coming into liquid state.

This is the reason why Solid CO2 is also knows as Dry Ice

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Solid carbon dioxide is called dry ice because:-

  • It is stored under high pressure
  • Solid carbon dioxide gets converted directly to gaseous state without liqufying on decreasing the pressure.
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Dry ice is the common name for the solid form of carbon dioxide. Originally the term 'dry ice' was a trademark for the solid carbon dioxide produced by Prest Air Devices (1925), but now it refers to any solid carbon dioxide.

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  1. Carbon dioxide is an odd substance because at regular pressure, it is only found in gas andsolidforms: the stuff in the air you breathe anddry ice. So whendry ice"melts" it goes directly into the gas form!At really high pressures, carbon dioxide does form a liquid phase.
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SOLID CARBON DIOXIDE IS CALLED DRY ICE BECAUSE IT SHOWS THE PROPERTY OF SUBLIMATION AS IT DIRECTLY SUBLIMATES FROM SOLID TO GASEOUS STATE WITHOUT GOING INTO LIQIUD STATE AND VICE-VERSA

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It is caled dry ice because it sublimes directly to solid state from gas and doest turn to liquid
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Solid CO2 is known as dry ice because CO2 turns to solid form without entering the liquid state and melts from solid without entering the liquid state.
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SOLID  CO2 IS CALLED  DRY ICE BECAUSE WHEN WE INCREASE THE PRESSURE OR DECREASE THE TEMPERATURE  OF CO2 IT DIRECTLY CONVERT FROM GAS TO SOLID .BECAUSE IT IS A SUBLIME SUBSTANCE .  
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