>>>>>Does anyone know what the rate of loss for liquid nitrogen is?
google: "thumper tube". I'm trying to think of which large 160 L LN2 tanks
have valves that you can open to allow access of the tube. It's pretty standard
on every liquid helium dewar and tank I've ever seen but not on standard LN2
It's been a while, but I used to insert the thumper tube all the way til it hit
bottom and then raise it slowly. When the frequency and amplitude of the
buzz changed, that was the top of the liquid. If you just go by the 'buzz'
upon insertion it's inaccurate because ... because ... I don't remember.
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