In article ,
Andrew Gabriel wrote:
In article ,
"ARWadsworth" writes:

You could fill the spare with Helium :-)

It would go flat very quickly - damn small those molecules, and
they leak out of just about everything!

A friend had this idea of taking a parcel into the post office to
be weighed for postage, but having it filled with helium, so when
the lady says please put it on the scales, it floats up to the
ceiling.

I then considered the idea of making bubble-wrap filled with
helium to make lighter parcels.

Not terribly effective though - I've tried it... You need a litre of
helium to lift about 1 gram and in small qualitities the weight of the
envelope will have to be catered for )-: Hydrogen is marignally better
- a litre lifts about 1.1 grams, but not many people like the idea of
bagged hydrogen..

Gordon