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- Pressure -

- Pressure -. Liquid and Atmospheric Pressure. Pressure Measurement. Definition of Pressure. by Rifki Irawan & Fiqri Hakim. Definition of Pressure. Pressure. is the force acting normally. or perpendiculary per unit area. F (N). force. P (Pa) =. Pressure =. A (m 2 ). area.

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- Pressure -

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  1. - Pressure - Liquid and Atmospheric Pressure Pressure Measurement Definition of Pressure by RifkiIrawan & Fiqri Hakim

  2. Definition of Pressure Pressure is the force acting normally or perpendiculary per unit area F (N) force P (Pa) = Pressure = A (m2) area SI unit for Pressure is Pascal (Pa) = 1 N m-2

  3. Weight = 100 N Area = 0.01 m2 Pressure = 10,000 Pa Weight = 100 N Area = 0.1 m2 Pressure = 1000 Pa “ same force, different area, different pressure “

  4. Example 1. The wind pressure on the wall is 100 Pa. If the wall has an area of 6 m2, what is the force exert on it? To solve this problem, you need to rearrange the pressure equation: Force = pressure x area = 100 Pa x 6 m2 = 600 N

  5. Example 2. A concrete block has a mass of 2,600 kg. If the block measures 0.5 m length by 1.0 m width and 2.0 m height, what is the maximum pressure of the concrete block that can exert when resting on the ground? (g = 10 m · s-2) Area= 0.5 m x 1.0 m = 0.5 m2 F = mass x gravitasi = 2,600 kg x 10 m · s-2 = 26,000 N Pressure = force/area = 26,000 N / 0.5 m2 = 52,000 Pa

  6. Liquid and Atmospheric Pressure “A liquid exerts pressure because of its weight” • Pressure acts in all direction • Pressure increases with depth • Pressure depends on the density of the liquid • Pressure does not depend on the shape of the container

  7. Volume liquid= base area x depth = A x h Weight= mass x gravity mass liquid= density x volume =  x A x h “pressure of the liquid depends on the density of the liquid itself” Weight liquid= mass liquid x gravity =  x A x h x g mass Density = volume Weight liquid= Force of the liquid =  A h g Force liquid  A h g Pressure liquid= Area container A Pressure liquid=  h g

  8. Example 1. If the density of water is 1.000 kg/m3, what is the pressure due to the water at the bottom of a swimming pool 2 m deep? First, define the data which given Density= 1.000 kg/m3 Height= 2 m Gravity= 10 N/kg Pressure = ρhg = 1,000 kg/m3 x 2 m x 10 N/kg = 20,000 Pa

  9. Atmospheric pressure The athmosphere is a deep ocean of air which surround the earth. In some ways, it is like liquid: • Its pressure acts in all directions. • Its pressure becomes less as you rise up through it Unlike a liquid, air can be compressed.

  10. Atmospheric pressure The pressure that will support a column of mercury 760.0 mm hight is known as standard atmospheric pressure or 1 atmosphere (1 atm) 1 atm = 100.000 Pa In weather forecasting we often used milibar (mb) 1 mb = 100 Pa

  11. The instruments • The mercury barometer Atmospheric press the mercury up the tube because the space at the top of the tube has no air in it. 760.0 mm Hg = 1 atm

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