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# stem: Pressure

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# stem: Pressure

a very simple presentation about pressure

a very simple presentation about pressure

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### stem: Pressure

1. 1. Tools of pressure Manometer Barometer The application of straw Pressure gauge
2. 2. What is pressure ? Pressure is the ratio between the force exerted upon specific area P = ‫ــــــــــــــــ‬ Pressure has the unit of N/M2 this unit is called Pascal in the SI system of units pressure may also use unit of Ib/in2 F A
3. 3. The manometer Manometer is a tool for measuring the pressure Figure.1 Figure.2
4. 4. Manometer depends on 3 factors; 1. the Height of the column of the fluid [H] 2. The density of the fluid [ρ] 3. The gravitaional constant [g] which equal 9.81 m/s2 So the pressure in manometer = H x ρ x g
5. 5. The barometer Measurement tool for pressure of gases [atmospheric pressure] It depends on the direct proportional between the pressure of the air [atmospheric pressure] and the height of the column of the mercury.
6. 6. The straw The straw depends on the idea of the barometer that; [as the atmospheric pressure decreases the height of the column of liquid increases]
7. 7. 1. When you take a smell by opening your lungs; 2. You increase the volume where the same air is separated, 3. Then the density of air is increasing. 4. The pressure of the air is decreasing and the air transport from high pressure to law. 5. The pressure in the straw get smaller. It makes the height of the liquid’s column increases
8. 8. Pressure gauge Measurement tool for pressure
9. 9. The measured fluid flow through the pump to make the needle to move. Where the needle stops, the read value is the value of the pressure
10. 10. Gauge pressure Vs total pressure Total pressure = the pressure on the surface of the liquid + the atmospheric pressure [gauge pressure] Gauge pressure = total pressure – the pressure on the surface of the liquid
11. 11. Problems