Chemistry Film Studio 15. Institutions will usually only have occasional access to liquid nitrogen and will probably wish to do all the liquid nitrogen demonstrations at once. They could be done as part of a lecture demonstration for interest and stimulation. The chapter on the properties of liquid oxygen thus ties in with this chapter closely. Various materials are immersed in liquid nitrogen to demonstrate the effects of low temperature on their physical properties.
Liquid air is made and distilled to show that it contains oxygen and nitrogen.
Liquid oxygen is made and its colour, magnetism and ability to support combustion are shown. Solid carbon dioxide is made. Liquid nitrogen is boiled and the gas used to inflate a balloon and shown the volume increase. Apparatus One vacuum flask - about 1.5dm is suitable. Ordinary household flasks appear to be suitable.