- Pressure at a point in a liquid depends upon the depth and on the density of the liquid.
- The pressure at any depth in a liquid acts equally in all directions.
- Liquids always find their own level.
- Pressure applied at any point in a confined liquid is transmitted equally in all the directions.
- Archimedes' Principle - When a body is partially or wholly immersed in a fluid (liquid or gas) it experiences an upthrust which is equal to the weight of the fluid displaced by it.
- Archimedes' Principle can be used to find the relative density of solids and liquids.
- Apparent loss suffered by a body is equal to the upthrust exerted by the fluid.
- Relative Density (R.D) of a solid
- Relative Density (R.D) of a liquid
- Principle of Flotation - When a body floats in a fluid, it displaces an amount of fluid equal to its own weight. The apparent weight of a floating body is zero.
- Hydrometers and submarines use the principle of flotation.
Words to Remember:-
Fluid, Atmospheric Pressure, Barometer, Buoyancy, Upthrust, Flotation, Hydrometer, Density, Relative Density.
