Why Dry Ice Used In Cinema Hall And Theatres

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What is a dry ice and what are its
properties? 

Solid carbon dioxide ( is known as dry ice. It is stored under high pressure. Solid
CO2 gets converted directly to gaseous state on decrease of pressure to 1 atmosphere without coming into liquid state (i.e. sublimes). 

This is the reason that solid carbon dioxide is also known as dry ice.

It is mainly used as cooling agent because its temperature is very low than water-ice. Dry ice is commonly used in theatres and in movies to produce the effect of fog.

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