4C Change of State – Physics Demos

4C10. PVT Surfaces
4C20. Phase Changes: Liquid-Solid
4C30. Phase Changes: Liquid-Gas
- 4C30.50 Bromine Condensation The color of bromine gas in one end of a tube is reduced when the other end is cooled.

4C31. Cooling by Evaporation
- 4C31.10 Cryophorous One end of an evacuated glass tube with bulbs at each end is put in liquid nitrogen, water in the other end will freeze.
- 4C31.30 Drinking Bird Cooling causes vapor to condense, raising the center of gravity until the bird tips, lowering the center of gravity.
4C32. Dew Point and Humidity
4C33. Vapor Pressure
- 4C33.50 Pulse Glass A tube with a small bulb on each end partially filled with a volatile liquid is held by one bulb in the palm forcing the liquid into the other bulb.
4C40. Sublimation
- 4C40.10 Dry Ice Sublimation Carbon dioxide slowly sublimates as it sits in room temperature.
- 4C40.12 Dry Ice Rocker Detect the evaporation of gas by the high pitched rocking motion of one end of an iron rod placed on dry ice.
- 4C40.15 Blow Up Balloon with CO2 Inflate a balloon with CO2 solid and deflate it using liquid nitrogen.
- 4C40.16 Change of Volume with Change of State Dry ice inflates a balloon.
4C45. Phase Changes: Solid – Solid
4C50. Critical Point
- 4C50.10 Critical Opalescence Shows the critical opalescence of CO2 heated while under pressure.