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Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
Is there a superconductor in liquid nitrogen? If there is then the magnet is floating in air and the white fog is small water droplets suspended in air.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Electroholic wrote ...
Paramagnetic LOX?
Correct, We have a winner.
I made about 50ml of liquid oxygen by passing medical grade O2 through a condensor in a dewar of LN2. I made it out of copper tubing which then dripped and sputtered into the container with a flow rate of about 1-3 l/min. The LOX container is kept in the bath of LN2 to stop it bubbling away. I have been able to confirm that LOX is blue tinged and will adhere to a magnet due to the paramagnetic properties. The close up photo shows a small NIB magnet with a crown of LOX over the top giving the muffin like appearance to the NIB. There is a blanket of cold air above it from the boiling LOX which in still air was very clearly defined. The setup was on an upside down styrofoam cup as a very shallow insulating dish.
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
Location:
Posts: 329
We had a professor give a demonstration with LN2, and he condesned O2 from a cylinder in a test tube. He then put it in a beaker, got a piece of steel wool smoldering with a lighter, and dropped it in the O2...
It cracked off/burned though the bottom of the beaker and scorched the table top.
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Mystery Photos from TDU
