Fluid: a substance that has definite mass but not definite shape. Ex: gases and liquids Density: mass/volume
ρ Units: ρ water = 1 g / cm^{3} =
__________kg/m^{2} = __________Kg/L
Weight of a Fluid – force gravity exerts on a fluid = mg Equation:
Specific Gravity - density of a fluid compared to the density of water. Specific Gravity - comparison of the density of a substance with the density of water
Pressure = F/A
N/m^{2} or Pascal
Pressure under a Liquid
P_{0 }–
pressure above liquid
(Density in liq. depends only on h)
(Density depends only on h)
P_{0
}– pressure above liquid
at sea level 1 atm = 1.013 x 10^{5} N/m^{2}
Pascal’s Principle If a force is applied on one place in an enclosed liquid the pressure
increases everywhere else in the liquid.
density of water = 1000 kg/m^{3}
Buoyancy "Archimedes Principle"
The buoyancy force produced by a liquid is equal to the weight of the volume displaced
F_{B} = mg
(r_{fluid})(V_{submerged})g
(r_{fluid})(V_{submerged})
Gauge Pressure - fluid pressure w/o atmospheric pressure Absolute Pressure - fluid pressure with atmospheric pressure
Apparent Mass or Weight - mass or weight in fluid
V of liquid displaced = V of object submerged
Density / Part Submerged
Partially Submerged /
©Tony Mangiacapre., St. Mary's H.S., Manhasset,
NY |
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