Does the Size of a Manometer Tube Affect Pressure Measurement Accuracy?

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SUMMARY

The discussion confirms that attaching a manometer to measure gas pressure does alter the volume available to the gas, resulting in a decrease in pressure. However, the diameter of the manometer tube does not significantly affect measurement accuracy. A smaller diameter tube provides more precise measurements as the volume increase is minimal compared to the overall system volume, making it negligible in pressure calculations.

PREREQUISITES
  • Understanding of gas laws and pressure measurement
  • Familiarity with manometer design and function
  • Knowledge of volume displacement effects in closed systems
  • Basic principles of fluid dynamics
NEXT STEPS
  • Research the principles of gas laws, particularly Boyle's Law
  • Learn about different types of manometers and their applications
  • Explore fluid dynamics concepts related to pressure measurement
  • Investigate the impact of tube diameter on measurement accuracy in various scenarios
USEFUL FOR

This discussion is beneficial for physics students, engineers, and professionals involved in pressure measurement and fluid dynamics, particularly those working with gas systems and manometer applications.

fishingspree2
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Hello

The teacher said that one way to measure the pressure of a gas enclosed in a room is to attach a manometer to it, like in that picture:
[PLAIN]http://img842.imageshack.us/img842/3994/manometer.jpg

By doing so, aren't we changing the volume the gas has access to, and thus changing the pressure of the gas?

Thank you very much
 
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Yes, there will be volume increase so decrease in pressure in the system. But there is no difference how big the diameter of the tube will be so more precise measurement you will have if the diameter of the tube is small so the increase of volume is small in respect of the volume of the system so you don't take it into account.
 

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