Tuesday, June 7, 2016

How can the boiling point and the liquefaction point of OXYGEN be the same (-183°C) when the liquefaction point of water is 0°C and its boiling...

Liquefaction means conversion to liquid. The liquefaction temperature of water ice at 1.00 atm pressure is 0 degrees C because, when heated, it begins to turn to liquid at that temperature. Similarly, oxygen gas will begin to turn to liquid when cooled to a temperature of -183 C. When warmed it changes back to gas at the same temperature, -183 degrees C, making that also its boiling point.


For a given substance at a given pressure, boiling...

Liquefaction means conversion to liquid. The liquefaction temperature of water ice at 1.00 atm pressure is 0 degrees C because, when heated, it begins to turn to liquid at that temperature. Similarly, oxygen gas will begin to turn to liquid when cooled to a temperature of -183 C. When warmed it changes back to gas at the same temperature, -183 degrees C, making that also its boiling point.


For a given substance at a given pressure, boiling and condensation temperatures are the same and melting and freezing temperatures are the same. Since a substance can become a liquid by either melting of the solid phase or condensation of the gas phase, a liquefaction point can be either a boiling point or a melting point.

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