Physics Quicksheets - Fluids and Solids
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[SI units: kg/m3
Specific Gravity =
a scalar quantity defined as force per unit area:
[SI Units: Pascal = N/m2]
Pressure of a Static Fluid:
For static fluids of uniform density in a sealed vessel, pressure:
P = ρgh
in a fluid due to gravity somewhere below the surface is given by the equation
P = P0 + ρgh
Absolute pressure is zero-referenced against a perfect vacuum, so it is equal to gauge pressure plus atmospheric pressure.
Gauge pressure is zero-referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure. Negative signs are usually omitted.
Pg = Pabs - Penvironment
V1A1 = V2A2
+ ρgh = constant
difference between object's weight in air and weight in fluid:
Fbuoyant = ρfluidgVsubmerged
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