introduction to hydrostatic pressure

Om Swastyastu

Today we will present a lesson about hydrostatic

pressure.

HYDROSTATIC PRESSUREPressureDensity

MAP OF PROCESS

Problems and Answer

Density

Density of a substance with uniform composition is defined as its mass per unit volume.The formula is :

ρ = density (kg/m3)m = mass (kg)V = volume (m3)

PRESSURE

Pressure is force that acting on an object divided by its area.Mathematically:

P= Pressure ( N/m2 = Pascal) F= Force (N) A= Surface Area (m2)A

FP

Hydrostatic Pressure

Hydrostatic pressure is the pressure exerted by a fluid at equilibrium due to the force of gravity.

Hydrostatic Pressure

Hydrostatic pressure can be calculated with the formula:

𝑃h=𝜌 h𝑔Where:Ph = Hydrostatic pressure (Pa or N/m2)ρ = Density of liquid (kg/m3 )g = earth’s gravity (m/s2)h = Depth (m)

Hydrostatic Pressure

If the container is open so there is atmosphere pressure from the air to the surface of liquid…

P = P0 + Ph = P0 + ρgh

The pressure become: P0 = Atmospheric pressure (1 atm = 76 cmHg = 1.013 x 105 Pa)

Known:ρ = 1 gr/cm3 = 1000 kg/m3

g = 10 m/s2

h = 50 cm = 0,5 mAsked: Ph....?

PROBLEMS AND SOLUTIONS

A tube with height 50 cm filled with water. If the density of the water 1 gr/cm3 and the gravitational force is 10 m/s2 then the hydrostatic pressure in the bottom of the tube is….

CalculateCalculating…Completed Answer:

Known:Ph = 1600 N/m2

g = 10 m/s2

h = 20 cm = 0,2 mAsked: ρ....?

PROBLEMS AND SOLUTIONS

In the glass cylinder there are 20 cm oil. With ignoring the outside pressure, the pressure on the bottom of the cylinder is 1600 N/m2. What is the density of the oil?

CalculateCalculating…Completed Answer:

Any Question?

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