Question

If the density of the liquid is greater, then the
pressure at the same depth will be :​

Answer 1

Answer:

The pressure in a liquid is different at different depths. Pressure increases as the depth increases. The pressure in a liquid is due to the weight of the column of water above. Since the particles in a liquid are tightly packed, this pressure acts in all directions. For example, the pressure acting on a dam at the bottom of a reservoir is greater than the pressure acting near the top. This is why dam walls are usually wedge-shaped. The greater pressure at the bottom would give a greater ‘force per unit area’ on the wall.

A large body of water is retained by a concrete dam. The dam should is thicker at the base than at the top.

Calculating pressure in a liquid

The pressure caused by a column of liquid can be calculated using the equation:

pressure = height of column × density of the liquid × gravitational field strength

p = h \: \rho \: g

This is when:

pressure (p) is measured in pascals (Pa)

height of column (h) is measured in metres (m)

density (ρ) is measured in kilograms per metre cubed (kg/m3)

gravitational field strength (g) is measured in newtons per kilogram (N/kg)

The symbol ρ is the Greek letter rho - it is pronounced ‘row’.

As shown in the equation, the height of the column isn’t the only thing that affects the pressure, the density of the liquid does too. As the density of the liquid increases, so does the pressure.

If the liquid is open to the air, there will also be atmospheric pressure on its surface.

Explanation:

Example

The density of water is 1,000 kg/m3. Calculate the pressure exerted by the water on the bottom of a 2.0 m deep swimming pool. (Gravitational field strength, g, is 10 N/kg.)

p = h \: \rho \: g

p = 2.0 \times 1,000 \times 10

p = 20,000 \: Pa

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Answer 2

fluid can either be gas or liquid. the density of a fluid is inversely proportional to its pressure hence, as pressure is increased, a decrease in density is observed, mass etc. being kept constant.

Hope it helps you mate...

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