For example, if you try to put your finger over the end of a tap when it is turned on, you can feel the pressure of the water in the pipe.

If a fluid (liquid or gas) has a density ρ, its pressure P, at a point due to the fluid of height h, is given by

where g = gravitational acceleration

Therefore, for a given liquid, its pressure:

i. increases with depth

ii. increases with density

For a given point in the fluid, its pressure acts equally in all directions.

It does not depend on the shape of containers,

__only on its depth.__

Quiz:

Example 1

If the density of sea water is 1150 kgm

^{-3}, calculate the pressure below 40m of sea water due to the water alone.

## 3 comments:

very good, but i had no idea... what does it means "deep water"?

p=hpg

=40x1150x10

= 46 kPa

more than 46 kPa!!

M i correct???

p= hpg

= 40x1150x10

= 460 000 Pa

= 460 kPa

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