Question

what happen when we apply pressure on CO2 and then lowering the temperature? write some uses.
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Please let Niharika answer. ​

Answer 1

Answer:

Carbon dioxide, for example, is a gas at room temperature and atmospheric pressure, but becomes a liquid under sufficiently high pressure. If the pressure is reduced, the temperature drops and the liquid carbon dioxide solidifies into a snow-like substance at the temperature -78°C.

Carbon dioxide is used as a refrigerant, in fire extinguishers, for inflating life rafts and life jackets, blasting coal, foaming rubber and plastics, promoting the growth of plants in greenhouses, immobilizing animals before slaughter, and in carbonated beverages.

Explanation:

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Answer 2

Answer:

High pressure may also cause a gas to change phase to a liquid. Carbon dioxide, for example, is a gas at room temperature and atmospheric pressure, but becomes a liquid under sufficiently high pressure. If the pressure is reduced, the temperature drops and the liquid carbon dioxide solidifies into a snow-like substance at the temperature –78ºC. Solid CO2 is called “dry ice.” Another example of a gas that can be in a liquid phase is liquid nitrogen (LN2). LN2 is made by liquefaction of atmospheric air (through compression and cooling). It boils at 77 K (–196ºC) at atmospheric pressure. LN2 is useful as a refrigerant and allows for the preservation of blood, sperm, and other biological materials. It is also used to reduce noise in electronic sensors and equipment, and to help cool down their current-carrying wires. In dermatology, LN2 is used to freeze and painlessly remove warts and other growths from the skin.