As someone who specifies and/or installs pumps, you need to know how these terms relate to each other. In the final analysis, they are the same, just expressed from two different points of view. Pump manufacturers supply feet (or meters) of head. This misunderstanding about head and pressure occurs daily all over the country … and, indeed, all over the world. Indignantly, I walked away and went to a competing industrial supply house - where I repeated the same verbal exchange with their sales rep. I wondered why the sales rep used different terms. The requisition chit clearly stated 30 psi. What is 70 feet of head?" I thought the sales rep was trying to do a "bait-and-switch" on me. I said, "Wait a minute! I don’t need 70 feet of head. He said, "This is the water pump you need. " He wrote it on the requisition.Īt the industrial supply house, the sales rep escorted me to the pump showroom. He said, "Get a water pump that pumps 30 psi at 400 gpm. He told me to go into the city and purchase another pump at the industrial supply house. When one of our water pumps failed in the cooling ponds one day, my boss gave me a requisition order and the keys to a company truck. So, the density of the gas cylinder is 30.Back in the mid-1960s, I was employed as an apprentice mechanic in a Birmingham, AL, steel mill. Now let’s apply pressure formula which is Then calculate the pressure at that depth? Solution:īy using the pressure formula we can find the pressure on the sunk ship. Also, the density of cold saltwater above it is 1,050 Kg/\(m^3\). If the wreckage of the ship that sunk in the ocean is 3,800 m under the ocean water. H = is the height of the column of gas or fluid (m) Solved Examples on Pressure Formula Example 1 G = is the acceleration of the object due to gravity (9.80 m/\(s^2\)) Ρ = is the density of the gas or fluid (kg/\(m^3\)) P = ρ ×g × h Derivation of the Pressure Equation Pressure = density of fluid × acceleration due to gravity × height of the fluid column In those conditions, the pressure of liquid or gas is equal to the density of that fluid multiplied by the acceleration due to the gravity and the height (depth) of the fluid above a certain point. Pressure Formulaīesides, we often calculate pressure for gases and fluids. On the other hand, for the bowling pin, the area touching the wall was much larger in comparison to the nail and as a result, the force was less concentrated. Moreover, for the nail the all the force amidst the wall and the nail was centered into the small area on the sharp tip of the nail. By this example, we came to know that just knowing the magnitude of the force is not enough you also need to know how that force will distribute on the surface of impact. In doing so you find out that nothing will happen to the bowling pin but it can damage your wall.īut, if in place of the bowling pin you use a nail and try to hammer it with same force then the nail would likely to penetrate the wall. Suppose you take a bowling pin and try to hammer it into a wall. Meaning of Pressureįor understanding pressure in a more clear sense let’s discuss a situation. Moreover, when you sip out the beverage from a straw, you firstly suck out the air from the straw? Also, when you sip the beverage you actually apply ‘pressure’. Moreover, the unit of pressure in Pascals (Pa).īesides, there are different types of pressures such as atmospheric, absolute, gauge, and differential pressure. Also, the force applied to the object is perpendicular to the surface of the object per unit area. We can define pressure as the physical force that we exert on an object.
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