The liquefaction of carbon dioxide is shown. In Part 3, the pressure in the tube continues to rise until the valve is opened, at which point the pressure drops and the liquid changes to solid.
The liquefaction of carbon dioxide is shown. In Part 4, an animation is used to illustrate the correlation between phase and pressure.
The relative viscosity of 1-pentanol can be measured using a stopwatch, and compared to other liquids.
A piece of glass is scratched with a diamond-tipped stylus, showing that diamond is harder than glass.