Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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ambient Air are in an
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Æquilibrium
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as to
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preſſure, and the weight of the Water
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that keeps them ſeparate is ſcarce conſi
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derable. </
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>Whereas in ſuch a Tube as we
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are ſpeaking of, the Air within is very
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much more dilated then that without; and
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'tis not ſo much the ſpring or reſiſtance
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of the included Air, as the weight of the
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Mercurial Cylinder it ſelf that hinders the
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Quick-ſilver from aſcending higher; for
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if we ſhould ſuppoſe that deſerted part of
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the Tube perfectly devoid of Air, yet
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would the Quick-ſilver riſe but a little
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higher in it, and be far from filling it, in
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regard the outward Air would not be
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able to impel up ſuch a weight much
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higher: whereas it may, by our former
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Experiments appear, that if all the Air in
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the upper part of a Weather-Glaſs were
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away, the Water would be impell'd up to
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the very top of it, though the Pipe were
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above thirty Foot long. </
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>We may next conſider, that this ra
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rified Air at the upper part of our Tube
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being exactly ſhut up betwixt the Glaſs
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and the Quick-ſilver, it was ſcarce ſubject
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to any diſcernable alterations, ſave thoſe
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it receiv'd from heat and cold. </
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