1 / 11

- 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.

amity
Download Presentation

- Pressure -

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related