Solved Examples on Fluid Pressure
Example 1: The relative density of gold is 19.32, calculate the density of gold.
Solution:
R .D. of gold = Density of gold / Density of water
Density of gold = R .D. of gold x Density of water = 19.32 x 1000 = 19320 kgm-3
Example 2: If the density of mercury is 1360 Kgm-3. Calculate the relative density of mercury. (Given Density of water = 1000 kg m3).
Solution:
R.D. of mercury = Density of mercury / Density of water R.D. of mercury = 1360 / 1000 = 13.6 Kgm-3
Example 3: A knife is applying a force of 20 N on a table. If the area of the point of the knife is 0.1 mm2, calculate the pressure applied on the table.
Solution:
F= 20NA = 0.1 mm2= 10-7 m2P = F/AP = 20/ 10-7P = 2 x 108 Pa
Fluid Pressure
Liquids and gases play an important role in our life. The earth’s atmosphere is so big as it appears like an ocean of gases. About 76% of the surface of the earth is covered with water. We cannot think of a life without gases (air) and water, Liquids are collectively known as fluids. A substance that flows under the action of an applied force and does not have a shape of its own is known as a liquid. The study of fluids which is at rest is known as hydrostatic or fluid statics. The study of hydrodynamics. In this article, we will have the study of liquids only.