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Pressure

Pressure. By Ankita naik (51) Shubhala salagaonkar (87) Suvidha naik (88). Pressure. Perpendicular force acting on the surface of an object per unit area on which it is acting is known as Pressure. SI  unit Pascal  [Pa]= N/m ^2. Units.

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Pressure

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  1. Pressure By Ankitanaik (51) Shubhalasalagaonkar(87) Suvidhanaik(88)

  2. Pressure Perpendicular force acting on the surface of an object per unit area on which it is acting is known as Pressure. SI unit Pascal  [Pa]= N/m^2

  3. Units • Aviation and television weather reports, pressure is given in inches of mercury(Hg). • Meterologist- mb (millibar) Other units • Psi- pounds per square inch • Dynes/cm^2

  4. Instruments Depending on pressure level. • Very high pressure->1000atm. • Low pressure-<133 Pa.

  5. Instruments • High pressure Measurement- Pressure gauge • Moderate pressure measurement- Manometer.

  6. Instruments • Low pressure measurement- Ionization gauge • Barometer

  7. Pressure (solids)

  8. Solids exert pressure only in the downward direction. Liquids apply pressure downward as well as to the sides. But gases apply pressure in all directions . This pressure is because of the bombardment of the particles against the walls of the vessel .

  9. High pressure application

  10. Low pressure • In order to reduce pressure of military tank on ground, the wheels are placed on steel track. • Bottom of snow shoes is about 6 times bigger than sole of a foot.

  11. Using pressure, car`s tires can keep all the weight. Massage is one type of application of pressure. This is because while giving pressure it pushes the nerves and we don’t get any pain later.

  12. Water pressure

  13. Hydraulic lift The use of hydraulic force, used in lifting the vehicles in the repairing shops.

  14. Scuba diving • Dive to just 10 meters deep and that pressure is doubled – because water is much denser than air, it exerts a much greater compressive force on your body.

  15. Facts • At 831 feet inside sea, we have reached the deepest free-dive in recorded history. • Down here, the pressure is 26 times greater than at the surface, which would crush most human lungs.

  16. But whales manage to diving to the maximum depth of 1640 feet where they hunt giant squid. • 9816ft is the deepest any mammal has been recording swimming, the elusive Cuvier’s beaked whale.

  17. Submarine • Inside water- pressure is same in all sides so the best shape for sub ,to be, is one that is same everywhere-circle. • shape- round through the whole length

  18. Air pressure

  19. Atmospheric pressure • The pressure at any location on the Earth, caused by the weight of the column of air above it is known as air pressure or Atmospheric pressure.

  20. Air pressure • At ground level there are most air molecules therefore pressure is more. • At greater heights, above Earth, there are fewer molecules and the air pressure is much less.

  21. Sky diving • On average, you fall 200 feet per second during a skydive. • From 10,000 feet, this means you'll be in freefall for approximately 30 seconds. • From 14,000 feet, you'll fall for 60 seconds. • From 18,000 feet, it's about 90 seconds

  22. Physics of skydiving • When a skydiver jumps out of a plane he starts accelerating downwards, until he reaches terminal speed. • Parachute helps in increasing air resistance therefore the acceleration decreases and the person lands safely.

  23. Airliners fly between 30,000 and 43,000 feet. At those altitudes the atmosphere provides less than 4 psi of pressure. To survive high altitudes, air is pumped into the airplane so the interior pressure is high.

  24. Why not fly down low? Airplanes can certainly fly below 10,000 feet where the atmospheric pressure is a comfy 10 psi or higher, but it has some drawbacks: Most bad weather is at lower altitudes. Turbofan engines are very inefficient down low. Aircraft ground speeds are slower at lower altitudes.

  25. Working of pressurization system • Pressurization system pump the outside air into fuselage and remove the stinky air out through outflow valve. • The door slowly open to reduce inside pressure and close down when high pressure is needed to maintain.

  26. Effect of air pressure on human

  27. Breathing As you use your muscles to open up your lungs, this causes a reduction in pressure within your lungs and because the atmospheric pressure around you is now higher, the air will equalize by flowing into your lungs.

  28. Effect of pressure on human body • The atmospheric pressure drops, so does your blood pressure. For some, this might mean a feeling of dizziness or even blurred vision. • Low atmospheric pressure leads to joint pains, headaches or migraine.

  29. Facts • Using pressure we could calculate the mountain`s height (before GPS existed). • We could predict if it would going to rain or not(if the pressure is low will rain, if it`s high it won`t rain). • Inside a bomb exist a easy flammable powder, which burn fast and become a gas which increases its volume thousands of times(and the pressure become higher), that produce the explosion.

  30. Facts • The highest barometric pressure- 1083.8mb (32 in) at Agata, Siberia, Russia (alt. 262m or 862ft) on 31 December 1968. • This pressure corresponds to being at an altitude of nearly 600 m (2,000 ft) below sea level. • Lowest atmospheric pressure- 870 millibar (25.69 in) was recorded on 12 Oct 1979 by the US Air Weather

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