# Hydrostatic Pressure vs. Osmotic Pressure

From the word of the Hydrostatic pressure, we mean the pressure that is experienced by a point present inside the fluid. The osmotic pressure, on the other hand, is the pressure required for stopping the fluid transfer of a semi permeable membrane. You need to apply the osmotic pressure in order to prevent the movement of a fluid in a semi permeable membrane. The movement of the fluid becomes possible due to the different levels of concentrations present between the two solutions, commonly known as the solute and the solvent. The appearance of the Osmotic pressure becomes possible at the time when the two solutions are separated with the help of a membrane. The function of this membrane is to allow the solvent to pass through it, but at the same time, the solute is not given the permission to do so. The Hydrostatic pressure is a specific type of pressure that is implemented on any point on a liquid which is at rest. The calculation of the pressure at that point is very simple as it is equivalent to the weight of the column of fluid which is present directly above that point. This is the main cause that the hydrostatic pressure is greatly subjective to the density of the fluid in which the pressure is being measured. The hydrostatic pressure is depended upon the atmospheric pressure, acceleration due to gravity, and the level of fluid above the point of measurement so you need to check these things while calculating the hydrostatic pressure. Contents:

### Hydrostatic Pressure

If you wish to measure the pressure of a static fluid then you are required to obtain the weight of the fluid column above the point on which you are trying to measure the pressure. This is the major reason that the pressure of a non-flowing fluid is totally dependent on some specific things such as the gravitational acceleration, the density of the fluid, the atmospheric pressure and the height of the liquid calculated above the point on which you need to measure the pressure. In other words, you can say that the Hydrostatic Pressure is the force that is exerted by the collisions of particles. From this definition, you can estimate the pressure by using the molecular kinetic theory of gasses and gas equation. The word of the Hydrostatic is formed by two terms, “hydro” which means water and the “static” which means non-changing. From the meaning of the hydrostatic word, the pressure of the non-flowing water is called the Hydrostatic Pressure. But in the practical implementation, the Hydrostatic Pressure is applicable to any fluid and even gasses. As the term of the hydrostatic pressure means the weight of the fluid column present just above the measured point, the formula of the hydrostatic pressure is “P = hdg”. From the letter, we mean the hydrostatic pressure, h denotes the height of the surface of the fluid just above the measured point and the letter d is used for the density of the fluid while the letter g is the gravitational acceleration. In order to calculate the total pressure on the measured point, you need to add the hydrostatic pressure and the external pressure that is known as the atmospheric pressure as well on the fluid surface. The fluid should be in static form in order to generate the Hydrostatic Pressure.