In article >,
Doug Freyburger > wrote:

> Default User wrote:
> > notbob wrote:
> >
> >> Liquid nitrogen is that super cold liquid that instantly freezes
> >> grapes so they shatter like glass.
>
> You can use an insulated cooler to freeze items with
> LN2. It does not last as long as in a dewar but if
> you're freezing grapes how long do you need.

I tried carbonating root beer for a party a couple weeks
ago with dry ice. It was a big hit--very dramatic,
with the bubbling, and the fogging, and the so-forth.
I was surprised to find that there was a place in North
East Minneapolis that appeared to sell three things:
dry ice, smokes, and beer. $1.39 a pound and you
bring the cooler.

But where would a civilian non-Bill-Nye kind of person
go to get liquid nitrogen, and what could you carry it
in over the short term? I assume an ordinary thermos
where you screw the plastic top on would have at least
three bad failure modes (excessive heat leakage, top
freezing and breaking, and explosion). Next party I
could try that instant ice cream trick . . . .

Mike Beede