A number of organisations have provided instructions on how to produce small quantities of liquid
oxygen in the classroom using liquid nitrogen and a copper condensation coil (Lister 1995 Classic
Chemistry Demonstrations (London: Royal Society of Chemistry) pp 61–2, French and Hibbert 2010 Phys.
Educ . 45 [http://dx.doi.org/10.1088/0031-9120/45/3/F01] 221–2
[http://dx.doi.org/10.1088/0031-9120/45/3/F01] ). The method presented below describes a process
which is believed to be safer as it contains the oxygen during production and produces a
controllable amount of the liquid. The method also has the advantage that it can be conducted using
cheap and easily available materials.