Re: [PSUBS-MAILIST]-pressure test/vacuum

[AndrePevestorf@aol.com]

In einer eMail vom 13.04.2002 05:34:57 (MEZ) - Mitteleurop. Sommerze schreibt jeffpost@rawbw.com:


> This absolutely not correct.
>  


It was more a joke. 
But seriously if the sub is complete wraped with dry sand (the hole must be bigger the the sub) the dry sand works nearly like a fluid and due to his strong density the pressure on the sub is high.
But you are right of course it would be a stupid idea to do that really...

To evaluate that dry sand can works like a fluid take a bucket pail put a tennis ball on the bottom and fill the pail with fine dry sand.
Nothing will happen.
Now shake the pail with a higher frequenz or put it in your car and drive offroad... 
The ball will go to the surface...

Under vibrations geological material like sand works as a fluid (but of course highly non NEWTON´s)

A.