Weighing fluids with immersed objects

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SUMMARY

The discussion centers on the principles of buoyancy and weight measurement using a scale with an immersed object, specifically a butterfly in a jar. When the butterfly is floating inside the jar without touching the bottom, it does not contribute to the scale's reading. However, once the lid is placed on the jar, the butterfly's weight is effectively added to the scale's reading, as the closed system now includes the butterfly's weight. The conversation also touches on the concept of impulse and its relevance to fluid dynamics in this context.

PREREQUISITES
  • Understanding of buoyancy principles
  • Basic knowledge of weight measurement techniques
  • Familiarity with fluid dynamics concepts
  • Knowledge of impulse in physics
NEXT STEPS
  • Research the principles of buoyancy and Archimedes' principle
  • Explore weight measurement techniques in closed systems
  • Study fluid dynamics and its applications in real-world scenarios
  • Learn about impulse and its effects on fluid behavior
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in understanding the principles of buoyancy and weight measurement in fluid dynamics.

maxbashi
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So imagine that in an open room you have a big scale and on it you have a jar and a lid sitting next to each other. Imagine a butterfly floating into the jar but not touching the bottom. I wouldn't think this would increase the reading on the scale. But if you put the lid on the jar, closing the butterfly inside, would the reading on the scale increase (compared to when the lid was sitting next to the jar on the scale?) Would the butterfly be "pushing down" on the scale now?
 
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Doesn't make too much difference if the lid is on. If there is air flowing to the bottom of the jar, the scale will pick it up. Look up impulse.
 

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