Question

How does the pressure exerted by the liquid changes with the depth? Explain with the diagram.​

Answer 1

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To understand this let's do an activity :-

NOTE :- This activity is according to the diagram to clear the concept.

So, let's start :

Take a tin can, some coloured water, a sharp pin/nail and some cellotape. Make holes with the pin at four different points, along a vertical line in the tin can, as shown in the figure. These holes should be equidistant. Cover the holes with cello tape. Place the Can on a stool and fill it with coloured water. Now , remove the tapes from the holes and observe the streams of water coming out of these holes. We observe that the stream, from the lower holes travel a larger distance. Why ? What do we infer ?

The emerging water goes out farther from the lower holes ; this is because the pressure of water increases with an increase in depth of the hole. Hence, the water pressure, at a point, increases with the height a water column above it.

Try repeating the steps of the above activity using, say vegetable oil* instead of coloured water. What do we observe? Do the stream of vegetable oil travel the same distance from the same holes ?

We thus observe that, for a particular liquid, the pressure, exerted at any point, (or depth of that point below the surface); however, this pressure is different for different liquids.

Hope you understand

Extra info :-

The pressure exerted by a given liquid, increases with depth. It is for the reason that submarines are always built with very thick and heavy metals. they have to which stand and enormous water pressure when they go deep down near to ocean floors.

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