PHYS 1010Q Lecture Notes - Lecture 15: Graphene, Buoyancy, Pressure Measurement
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PHYS 1010Q Full Course Notes
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Pressure is determined by how far down you are from the top of the fluid. The pressure at the bottom is therefore bigger at the bottom than at the top. That gives you an upwards force against gravity. Ex. you float in the swimming pool instead of sinking to the bottom. Question 1 - the device pictured to the right is know as a manometer. It is used to measure the pressure of the atmosphere. In this device, a thick heavy liquid [mercury (hg) works well] fills the tray and much of the tube. At what height (h) is the pressure of a column of hg equal to 1 atm? (d hg = 10 g/cm 3 ) P = dgh h = p/dg. Buoyancy is the force that competes with the weight to determine if objects float upward or sink downwards.
