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Liquids: Force, pressure, and density. Floating and immersed bodies. Laws: Liquid force, F = A.h.d, Pascal's, Archimedes. Illustrations and Applications:

Specific gravity, W_{a}/(W_{a} - W_{w}), (W_{a} - W_{l})/(W_{a} - W_{w}), Boyle's, PV = P´V´

Devices: Hydraulic press, air cushion, barometer—mercurial and aneroid. Pumps, lift, force, vacuum, compression, centrifugal, balloon, siphon, etc. Construction and action of each.