How to set this proportion
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How to set this proportion

[From: ] [author: ] [Date: 12-06-08] [Hit: ]
How to set it as a proportion? Im in doubt between D1*A1=D2*A2 and D1/A1=D2/A2.How do I figure which proportion is correct?-The fluid is incompressible. Therefore the volume displaced by depressing a piston mus displace the other piston through an equal volume. The volume displaced is piston travel times cross-sectional area.......
In a hydraulic jack http://www.flickr.com/photos/76342179@N0…
,if I push one side (of area A1) over a distance D1, the other side (of area A2) will raise a distance D2.

How to set it as a proportion? I'm in doubt between D1*A1=D2*A2 and D1/A1=D2/A2.
How do I figure which proportion is correct?

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The fluid is incompressible. Therefore the volume displaced by depressing a piston mus displace the other piston through an equal volume. The volume displaced is piston travel times cross-sectional area.

A1D1 = A2D2, your first choice.
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