Re: HOLES AS CARRIERS Negative mass?

[Robert Cohen <Robert.Cohen@PO-BOX.ESU.EDU>]

On Wed, 10 Oct 2001, I wrote:

> Is it appropriate to say that the bubble has negative mass?  The
> gravitational force on the bubble is still down, no?  I'm
> missing something here.

On Thursday, October 11, William Beaty wrote:

> True unless we neglect the mass of the air ..or perform the
> experiment in
> a vacuum!  Use an evacuated bottle which is 90% full of some
> fluid having
> low vapor pressure.  The bubble of vacuum will still act the same as a
> bubble of air even though it contains no matter.

Perhaps I should word my question as follows:

Is it appropriate to say that the bubble has negative mass?  The
gravitational force on the bubble is still down or zero, no?  I'm
still missing something here.

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| Robert Cohen               Department of Physics       |
|                            East Stroudsburg University |
| rcohen@po-box.esu.edu      East Stroudsburg, PA  18301 |
| http://www.esu.edu/~bbq/   (570) 422-3428              |
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