In aeronautics, we use cryogenic technology for using liquid oxygen as fuel. In small scale lab its highly difficult to convert gas to liquid as boiling point of liquid oxygen is 90.188 K (-182.96 °C). It is a strong oxidant and organic compounds can burn fiercely in it and even explode.
Here i can add a small technique which i collected from my coauthor and i hope it may help you""""""::::Take a length of 1/4" copper tubing and form it into a coil, maybe six turns of 2" diameter, with about 12" straight lengths at each end. Take a plastic bucket, about 1 litre capacity, and cut a hole in the bottom just big enough to allow the copper tubing through. Insert the coil into the bucket so that the coil will be submerged when the bucket is near full, with the end of the coil protruding through the hole in the bottom. Seal around the hole with some sort of caulking, so the bucket doesn't leak. Connect the top end of the copper tube to the oxygen tank. Fill the bucket with liquid nitrogen, and wait a couple of minutes for everything to cool down. Top off the liquid nitrogen in the bucket. Open the valve on the oxygen tank just a little, until you see liquid dripping out of the bottom of the copper tube. This is liquid oxygen.:::""""
my dear, this link maybe help you
https://en.wikipedia.org/wiki/Liquid_oxygen
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