Casati, Paolo
,
De igne dissertationes physicae
,
1686
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Diſſertatio Quinta.
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que tamen terram aut panem itidem rareſcere dicimus, vt aquam
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in fumum abeuntem. </
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<
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">Longè ſcilicet aliud eſt intrà diſtractarum
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particularum interualla admittere ætherem, commune corpus per
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omnia diffuſum, aliud eſt ingeſto humore aërem aut ætherem à
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poris excludi, eodemque humore abundantiùs irrumpente, ter-
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ræ aut panis particulas propelli, ex quo oritur tumor. </
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<
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xml:space
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">Quando
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aqua in vaporem ſoluitur vi Caloris, tria contingere intelligo:
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<
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xml:space
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">primùm ſe inſinuant igniculi in aquam, atque peruadunt, eo-
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rumque incurſione pulſantur, & </
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<
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">agitantur particulæ. </
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<
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">Alterum
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huic impulſioni conſequens eſt, quod aqueæ particulæ dum com-
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mouentur, à ſe inuicem digredientes locum ampliorem occupant,
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molemque maiorem præſeferunt. </
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<
s
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xml:space
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">Tertium eſt, quod in interual-
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la inter diſiunctas aquæ particulas interiecta, vbi ſe agitant igni-
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culi, ſuccedit æther ex proximo corpore tantiſper compreſſo ex-
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preſſus: </
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<
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xml:space
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">neque enim fieri poteſt, vt corpus aliquod ad ampliora
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ſpatia ſe explicet, quin proximum ſe contrahere cogatur, aut
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ſaltem propulſum comprimat aliud ſibi cohærens. </
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<
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">Ex his tribus
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primum tanquam cauſa antegreditur raritatem aquæ, immiſſio
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quippe igniculorum effectrix eſt diffuſionis partium: </
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<
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">tertium hanc
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dilatationem conſequitur, ſuccedente æthere in interualla, ne
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quid inane reliquatur. </
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<
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xml:space
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">Quare, licèt in rarefactione contingat
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alienorum corpuſculorum admiſtio, ſiuè vt quid antecedens, ſi-
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ue vt quid conſequens raritatem, ipſa tamen raritatis notio in eo
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conſiſtit, quod multum loci exigua materia occupet, quę pro-
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pterea rareſcere dicitur, cùm ad ampliora ſpatia ſe explicat. </
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<
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">Cum
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igitur in motu corpus occupet ſpatium, per quod mouetur, ac pro-
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pterea plus occupet ſpatij in motu, quàm quieſcens, fieri non
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poteſt, quin ad ampliora ſpatia ſe dilatet incaleſcens, quando-
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quidem eius particulæ agitantur: </
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<
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">ideò Calor dicitur cauſa ra-
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ritatis.</
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">Perdifficilis & </
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">perobſcura quæſtio eſt de Rarefactione, in
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quam nec aduertentes delapſi eſtis: </
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">ſi verò illam in Vulgarem & </
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Philoſophicam, vt quibuſdam placet, partiri volueritis, nullus
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erit diſputandi ſinis, & </
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">inſtituta noſtra de Calore diſſertatio, ex
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huius immiſſione, in fumum reſoluta abibit. </
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<
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">Quapropter ſiuè
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ſola contingat particularum diſtractio admiſſo in interualla æthe-
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re, ſiue diſtractæ particulæ ampliorem Vbicationem nacte maio-
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rem in molem excreſcant, ſiue quacunque tandem aliâ </
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