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Pressure in liquids and gases. Pascal law 7th grade №3 Talapker Secondary School Kaliyeva Aigul Kairgeldinovna Physics Teacher Паскаль Блез 1623 -1662

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Pressure is a value equal to the ratio of the force acting perpendicular to the surface to the area of ​​this surface. Pressure calculation formula Where  p – pressure  F - applied pressure force   S - surface area / otherwise body support area /

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Pressure in liquids and gases of Pascal's Law Why does the ball increase its volume? •Conclusion:   • The pressure of the gas on the walls of the vessel and placed in the gas   the body is caused by the impact of gas molecules.

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What does gas pressure depend on? Conclusion: Gas temperature From the volume occupied by the gas.

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How do gases and liquids impart pressure? Pascal's law Liquids and gases transfer pressure in all directions equally.

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Pressure units  Pa (Pascal) 1 Pa is the pressure that the 1H force produces, acting on a surface of 1 m2, perpendicular to this surface •Multiple and long units: • 1 kPa = 1000 Pa 1Pa = 0.001 kPa •1 MPa = 1000000 Pa 1 Pa = 0.000001 MPa •1 hPa = 100 Pa 1 Pa = 0.01 hPa Tanometr Manometr

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Fluid pressure calculation ShV Vm mgF S F p      ghp

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Exercises •The DT-75M tracked tractor with a weight of 6610 kg has a reference area of ​​both tracks of 1.4 m2. What pressure does the tractor apply to the soil? •Given •m= 6610 kg •S= 1,4 m 2 •р = ? •Answer: P=46 270Pa

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1 2 3 Complete tasks:

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1.If you fully understand the topic then pick up a green apple 2.If you’ve half understood the topic of a lesson then pick up a yellow apple 3. If you do not understand the topic of the lesson then pick up a red apple

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