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What are the conditions for sublimation?
2 atmosphere, without coming to the liquid state
1 atmosphere, without coming to the liquid state
3 atmosphere, without coming to the liquid state
4 atmosphere, without coming to the liquid state
1 atmosphere, without coming to the liquid state
Solid carbon dioxide, commonly known as 'dry ice', undergoes sublimation at atmospheric pressure. This means it transitions directly from the solid phase to the gaseous phase without passing through the liquid phase at standard atmospheric pressure (1 atm).
Solid carbon dioxide, commonly known as 'dry ice', undergoes sublimation at atmospheric pressure. This means it transitions directly from the solid phase to the gaseous phase without passing through the liquid phase at standard atmospheric pressure (1 atm).
Dry ice behaves like a block of ice that 'disappears' into thin air instead of leaving a puddle of water behind; this is exactly why it is called 'dry' ice.
PtripleтАЛ=5.11┬аatm тАФ the minimum pressure required for liquid CO2тАЛ to exist
TsublimationтАЛтЙИтИТ78.5┬░C тАФ the temperature at which dry ice sublimes at 1 atm
The triple point of CO2тАЛ is at 5.11┬аatm and тИТ56.4┬░C. Below this pressure, the liquid phase cannot exist at any temperature. Therefore, at 1┬аatm (standard atmospheric pressure), solid CO2тАЛ directly absorbs heat and converts into CO2тАЛ gas through sublimation.
Sublimation is a phase transition where a substance changes from solid directly to gas.
Carbon dioxide does not melt under normal atmospheric conditions.
The triple point of CO2тАЛ is significantly higher than 1 atm, making solid-to-gas transition the standard behavior.
Useful for cooling applications without residue (no liquid spill).
Extreme cold can cause frostbite; requires careful handling.
Theatrical fog effects
Preservation of perishable food during transport
Dry ice is used extensively in cold chain logistics.
Option A, C, and D are incorrect as the phase transition to gas occurs at 1 atm, not higher pressures where liquid CO2тАЛ can exist.
B is correct тАФ Solid CO2тАЛ converts directly into gas at 1 atmosphere of pressure through the process of sublimation.
Always remember that substances with triple point pressures above 1 atm will sublime at sea level (like Dry Ice or Iodine), whereas those with triple point pressures below 1 atm will melt.
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