The force exerted on the dam by the water is the average pressure times the area of contact latex fpa. Standard 980665ms 2 ρ density of liquid ρ0 density of fresh water 1000 kgm 3 at 4c sg specific gravity of liquid eg. Fluid column height in the relationship is often used for the measurement of pressure. And where p is pressure ρ is density g is acceleration of gravity and h is height. Pressure varies with height as a function of specific weight. δh express head the height difference of a column of fluid of specific weight γ required to give a pressure difference δp p 2 p 1.

Formulas l liquid height p pressure g local gravity eg. Saturation pressure feet water column and specific weight pound per cubic foot of water at temperatures ranging 32 to 212 o f are indicated below. Vapor pressure and specific weight of water at temperatures ranging 32 to 212 o f imperial units. P fluid pressure on an object at depth. After entering the relevant data any one of the highlighted quantities below can be calculated by clicking on it. Temperature t o f specific weight γ lbft 3 absolute pressure.

So pressureheight density of liquid at 4c pure water has a density weight or mass of about 1 gcucm 1 gml1 kgliter 1000 kgcum 1 tonnecum or 624 lbcuft the weight of a mass. A p ressure on an object submerged in a fluid is calculated with the below equation. The delta symbol indicates a change in a given variable. The average pressure due to the weight of a fluid is. P fluid r g h 2. Pp0specific weightheight where height is the distance below the reference pressure p0 usually at a free surface.

Fresh water 1. Ntp normal temperature and pressure defined as 20 o c 29315 k 68 o f and 1 atm 101325 knm2 101325 kpa 147 psia 0 psig 30 in hg 760 torr. Or head in mercury. A pressure difference of 5 psi lb f in 2 is equivalent to head in water 5 lb f in 2 12 inft 12 inft 624 lbft 3 116 ft of water. A relatively simple version of the vertical fluid pressure variation is simply that the pressure difference between two elevations is the product of elevation change gravity and densitythe equation is as follows. H the height of the fluid above the object or just the depth of.

Example pressure vs. G the acceleration on of gravity the gravity of earth. Molecular weights can be used to calculate specific gravity if the densities of the gas and the air are evaluated at the same pressure and temperature. Pressure difference densityx g x height. Rrho density of the sea water. The average pressure p due to the weight of the water is the pressure at the average depth h of 400 m since pressure increases linearly with depth.

Gallery of Pressure Specific Weight Height