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Dear Vo,
You may be interested in this reference to a
gravitational mass change that occurs during a phase change from liquid to
solid.- ( a possible relationship between latent heat and
gravitational energy?) My overall impression from reading on this
subject for a bit is that the greatest gravitational changes probably occur
when there is a sublimation phase change from solid to gas or a
change to a plasma.
Water vapor <=> water liquid
<=> ice, should show this effect to a
degree.
I first read reports of this regarding some
experiments in a book purchased from an antiquarian bookstore in
Toronto.
"SOME UNRECOGNIZED LAWS OF NATURE" (483
pages)
"An Inquiry into the causes of physical phenomena with
special reference to gravitation"
by Ignatius Singer and Lewis H. Berens.
1897- London - pub: John Murray, Albemarle Street.
Oxford.
Horace Hart, Printer to the University.
Note also in this Link to the Niels Bohr
Library that in the same year it was also published in NY by D.
Appleton and Co, 511 pages:
(NY publication was longer by 28 pages.
)
Chapter V -- Gravity (pages 373 to
394)
QUOTES:
(p. 383.)
[...] Still more definite are the results of the following
experiment. A supersaturated solution of sodium hyposulphite was obtained by
dissolving three parts by weight of the salt in one part of hot water, and
allowing it to cool. The glass-stoppered flask was then placed on the
balance and weighed along with a small crystal of the same salt. By now
dropping the crystal into the solution, crystallization set in ; and although
the weight of solution, flask, and all, did not exceed 60 grammes, and the
difference of temperature before and after crystallization was not more than 20
degrees C. (at the utmost), the difference in weight amounted to 25 mgr. :
whereas with a brass weight of 100 grammes and a difference of temperature of
over 80 degrees C. the difference in weight was only 10 mgr. Whether this
difference in weight be attributed to ascending air currents or to expulsion of
moisture from the pores of the glass (?), these facts would remain unexplained.
Moreover, in the case of the heated brass weights equilibrium is established in
a comparatively short time, whereas in the case of the hyposulphite it requires
several hours."
(p. 386.)
"2. That in the case of
bodies weighed during or immediately after crystallization ( as with a cold
saturated solution of sodium hyposulphite ) the loss in weight is
considerably greater than with, say, metals heated to a much higher
temperature.
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Vorts,
one might obtain an interlibrary loan on this
book. I once obtained a loan up here in Canada from a US library directly to the
Reference library in Toronto on a book by William Sturgeon published in
1850. I copied all pages of interest. This particular book might
also be in "reference library" circulation.
It was the authors' contention throughout the chapter
on gravity that gravitational mass can be modified by "excitation", and
they give references, plus their own experiments to prove that contention ; that
is, *any* kind of excitation- phase changes,
vibration, etc.
Best,
Colin
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