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In first situation; pressures at points x and y are equal. Px=pressure of gas and Py=h+P₀thus;

Pgas=P₀+h

In second situation, pressures at point x and y are also equal and Px=pressure of gas and Py=P₀ thus;

Pgas=P₀

In third situation; pressures at point x and y are also equal and Px=pressure of gas+h and Py=P₀ thus;

Pgas+h=P₀

Pgas=P₀-h

Example: Find the relation between gases X, Y, Z in the manometers given below.

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1. Pressure in liquid is owing to the weight of the liquid acting on the surface of any objects in the liquid.

2. Pressure of a liquid is directly proportional to

1. the gravitational field strength

2. the depth

3. density of the liquid.

3. Pressure in liquids is not affected by the size or shape of the object.

4. The pressure caused by a liquid and the pressure in a liquid can be determined by using the equation below:

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pressure is defined as the normal force acting per unit cross-sectional area.

SI unit is Pa ( Pascal) or N/m²

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Density is defined as mass per unit volume of a substance.

Density is a property of matter

1g cm⁻³ = 1000 kg m⁻³