Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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bubbles, the greater they will grow, be
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cauſe having the leſs weight and preſſure
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upon them, the Expanſion of that Air
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which makes them, can be the leſs reſiſted
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by the preſſure of the incumbent Water
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and Air; as ſeems probable from hence,
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that upon the letting in a little external
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Air, thoſe bubbles immediately ſhrink. </
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Experi
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ment
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22.</
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>It may indeed, as we lately intimated,
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be conjectur'd, that theſe bubbles pro
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ceed not ſo much from any Air pre-exi
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ſtent in the Water, and lurking in the
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Pores of it, as from the more ſubtle parts
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of the Water it ſelf; which by the expan
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ſion allow'd them upon the diminiſh'd
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preſſure of the ambient Bodies may gene
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rate ſuch bubbles. </
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<
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>And indeed, I am not
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yet ſo well ſatisfied that bubbles may not
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(at leaſt ſometimes) have ſuch an Origina
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tion: but that which makes me ſuſpect
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that thoſe in our tryals contain'd real Air
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formerly latitant in the Pores of the Wa
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ter, is this, That upon the inletting of
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the external Air, the Water was not
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again impell'd to the very top of the
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Tube whence it began to fall, but was
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ſtopt in its aſcent near an Inch beneath
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the top. </
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<
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>And ſince, if the upper part of
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the Tube had been devoyd of any other </
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