Some Important Facts
Normal atmospheric pressure is equal to 76 cm of height of
mercury in the Barometer.
If h is the barometric height for a liquid of density d,
then,
hdg = 76 x 13.6 x g or h = 76 x 13.6 / d
Relative Density = Density of Body / Density of Water at 4°C
A pressure applied at any point of the fluid is equally
transmitted in all the directions.
Pressure is force acting perpendicular on unit area of a
surface.
Pressure (P) = Force (F) / Area (A)
Pressure is scalar quantity and its unit is N/m² or Pascal
(Pa).
Density of a substance can be defined as the ratio of its
mass to its volume.
Density (d) = Mass (M) / Volume (v)
The unit of density is kg / m³
If we mix equal volumes of two liquids of density d₁
and d₂,
then the density of the mixture is
d = d₁ + d₂ / 2
If we mix two liquids of same mass with densities d₁
and d₂,
then the density of the mixture is
d = 2d₁d₂ / d₁ + d₂
If we mix two liquids of mass m₁ and m₂ having densities d₁
and d₂,
then the density of the mixture is
d = m₁ + m₂ / m₁/d₁ + m₂/d₂
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