Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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1

Cap. 7. dę
natura flui­
ditatis.
PROP. CLII.
Completa diſſolutione ſalis particulæ eius innatantes non ſu­
ſpenduntur ab intestina aquæ commotione, ſed ab eius
naturali glutine validiùs operante in ſuperfi­
cieculis particularum ſalium.
SEd huic difficultati reſpondeo, non ab impetu aquę
agitatæ, ſed ab alia longè diuerſa cauſa grauio­
res particulas innatantes ſuſtineri poſſe.
Certum eſt
corporum particulas quò tenuiores, & minutiores
ſunt, eò tardiùs per fluida deſcendere, vt contingit
in puluere terreſtri in aere, vel aqua diſperſo, quią
nimirùm in hiſce corpuſculis exiguis eorum ſuperfi­
cies externa ſemper magis, ac magis creſcit in re­
ſpectu ad ſuam grauitatem, vt alibi declarauimus;
quia verò menſura impedimenti fluidi externi auge­
tur, prout prędicta ſuperficies creſcit cum nullum cor­
pus per fluidum moueri queat, quin ſucceſſiuè è loco
anteriori fluidum ei contiguum expellat, quotieſ­
cumque vis impulſiua grauitatis minuitur pro molis
diminutione, ſuperficies verò in multo minori ſcili­
cèt ſubduplicata proportione diminuitur, ſequitur,
vt fluidi impedimentum minus decreſcendo, dum̨
impetus grauitatis valdè minuitur, tandem ad æqua­
litatem, & æquilibrium quam proximè accedant, &
proindè hoc nomine particulæ minimæ fluido graui­
ores motu ſemper tardiori in ipſo deſcendent quo
magis eorum moles imminuitur.

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