Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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SECTIO DECIMA.
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nempe aëris ordinarii decies millies major; </
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xml:space
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">ſequitur inde auram illam elaſti-
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cam, quæ ex pulvere pyrio accenſo elicitur aut non aërem eſſe communem
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aut elaſticitates in majori ratione creſcere quam denſitates: </
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xml:space
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denſitas aëris, qui à pulvere modo inflammato oritur, eſſe plus quam millies
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denſitate aëris ordinarii major, ſi pulvis vel totus ex aëre compreſſo compo-
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ſitus ſit, quod ex gravitate pulveris ſpecifica ratione aëris concludo.</
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<
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">Quæſtio interim jamdudum eſt agitata, an aura elaſtica factitia, quæ ex
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corporibus deducitur, aër ſit ordinarius nec ne, quam ego quæſtionem non
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decidam.</
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<
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xml:space
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">Si tamen ponatur, pulverem pyrium aërem eſſe naturali millies den-
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ſiorem & </
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<
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xml:space
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nita compreſſum non poſſe pluribus quam 1331. </
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<
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dum eandem regulam foret aëris naturali quadruplo denſioris elaſticitas ad ela-
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ſticitatem aëris naturalis ut 4 {1/4} ad 1.</
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<
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">An vero experimenta ab aliis inſtituta, quæ harum elaſticitatum ratio-
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nem faciunt accurate ut 4 ad 1 ſufficiente accuratione facta fuerint & </
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aëris dum comprimebatur idem permanſerit? </
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</
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<
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">eandem auram quæ in poris pulveris pyrii latet, cauſam eſſe elaſticitatis cor-
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porum elaſticorum aut villorum contractilium: </
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<
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">dum enim in cavernulis ſcatet,
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ſi corpora in figuram inſolitam vi quadam redigantur, comprimitur aura ela-
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ſtica, cavernuliſque dum reddit figuram capaciſſimam corpus reſtituit in pri-
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ſtinam figuram & </
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