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what will happen if the pressure is reduced on solid carbon dioxide
Then it becomes  dry ice.
Dry Ice is the common name for solid carbon dioxide (CO2). It gets this name because it does not melt into a liquid when heated; instead, it changes directly into a gas (This process is known as sublimation).
Dry ice is frozen carbon dioxide (C02), the gas we exhale as we breathe. It is much denser and colder than traditional ice. Dry Ice is -109.3º F (-78.5º C). Traditional ice is 32º F (0 degrees C). In addition, dry ice doesn't melt - it sublimates. Sublimation is the process of going directly from a solid to a gas. Dry ice bypasses the liquid form, giving it its name "dry" ice.


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