In this research, we studied the methods of cryogenics depended on Joule-Thomson
effect. We studied in-depth what the other researchers( KAPITZA, CLAUDE,
HELANDT and others) do to reach low temperatures and thus to the
liquefaction temperature of
air.
We studied in detail the effects of throttling and expansion and we compared
them to the possibility of use both and the ideal conditions to use both of
them.
