Calculating pressure in a barometer

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SUMMARY

The discussion focuses on calculating the pressure inside a piston-cylinder device using the given parameters: a piston mass of 4 kg, a cross-sectional area of 35 cm², and a spring force of 60 N. The atmospheric pressure is stated as 95 kPa. The pressure inside the cylinder is determined by summing the forces acting on the piston and dividing by the piston area, resulting in a pressure calculation in pascals.

PREREQUISITES
  • Understanding of basic physics concepts, specifically pressure and force.
  • Knowledge of the relationship between force, area, and pressure.
  • Familiarity with unit conversions, particularly between kPa and pascals.
  • Experience with calculations involving piston-cylinder systems.
NEXT STEPS
  • Study the principles of fluid mechanics, focusing on pressure calculations.
  • Learn about the behavior of gases in piston-cylinder devices.
  • Explore the effects of atmospheric pressure on enclosed gases.
  • Investigate the applications of pressure calculations in engineering contexts.
USEFUL FOR

Students in physics or engineering, mechanical engineers, and anyone involved in thermodynamics or fluid mechanics will benefit from this discussion.

hazar
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A gas is contained in a vertical frictionless piston-cylinder device. The piston has a mass of 4 kg and cross sectional area of 35 cm2. A compressed spring above the piston exerts a force of 60N on the piston. If the atmospheric pressure is 95 kPa, determine the pressure inside the cylinder.


how do you solve this question
 
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assuming pressure to be uniformily applied, you can just divide total force (4*9.81 + 60 + 95*1000* 35*0.0001) by piston area (35*0.0001). you will answer in pascal.
 

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