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firewatch

If boiling is indeed an endothermic process, then shouldn’t it be possible to boil a liquid until it freezes? In this very simple, yet elegant demonstration, liquid nitrogen is placed in a bell jar and once the pressure is decreased to about 0.14 atm, the boiling nitrogen quickly freezes over!

Concepts

  • Kinetic Molecular Theory
  • Gas Laws
  • Pressure
  • Volume
  • Temperature