What is sublimation in phase transition?
Sublimation is the direct transition from solid to gas without melting. This process skips the intermediate liquid state entirely.
Questions about Sublimation (phase transition)
Short answers, pulled from the story.
When does carbon dioxide sublime instead of melt?
Carbon dioxide sublimes below 5.1 atmospheres of pressure because its triple point sits much higher than standard atmospheric pressure. The substance moves straight along the solid-gas boundary line on its phase diagram under these conditions.
How do scientists calculate the enthalpy of sublimation?
Chemists calculate this value by adding the enthalpy of fusion and the enthalpy of vaporization together. They also apply thermodynamic adjustments including molar ideal gas corrections and vibrational contributions to approximate the final enthalpy.
Where does dry ice sublime at minus 78.5 degrees Celsius?
Dry ice sublimes rapidly along the solid-gas boundary at minus 78.5 degrees Celsius under one atmosphere. It cannot exist as a liquid at standard pressure due to the high position of its triple point.
Who wrote about sublimation in Le char triomphal de l'antimoine published in 1646?
Basil Valentine wrote about sublimation in his text Le char triomphal de l'antimoine published in 1646. He compared the process to spagyrics where vegetable sublimation separates spirits in wine and beer.