Jones Beene <jone...@pacbell.net> wrote:
> Here is the page from Tel Aviv University:**** > > ** ** > > http://www.tau.ac.il/~supercon/**** > > ** ** > > It is likely that the white disc is a composite sandwich of materials which > is mostly (90%) merely a thermal insulator - possibly a white cloth or foam > of some kind holding a 'supply' of LN for an extended time of operation. > I thought it was solid nitrogen. I thought the person asking questions referred to it as "liquid nitrogen" out of force of habit, but he meant "solid." I have seen solids which were referred to as nitrogen, looking like dry ice (solid CO2). Wikipedia sez: "Liquid nitrogen can easily be converted to the solid by placing it in a vacuum chamber pumped by a rotary vacuum pump. Liquid nitrogen freezes at 63 K (-210 °C; -346 °F)." - Jed
