Determine bubble volume change with given temperature

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SUMMARY

The discussion focuses on calculating the volume change of a 1-cm³ air bubble as it rises from a depth of 141 meters in a lake, transitioning from a temperature of 4 degrees Celsius to 13.1 degrees Celsius. The relevant equation used is the combined gas law: P1V1/T1 = P2V2/T2. Participants noted confusion regarding the appropriate pressure values to use, specifically whether to apply atmospheric pressure (1.013 x 10^5 Pa) or hydrostatic pressure (1000 kg/m³). It was concluded that while both pressure values yield similar results, clarity in the chosen value is essential for accuracy.

PREREQUISITES
  • Understanding of the combined gas law
  • Knowledge of hydrostatic pressure calculations
  • Familiarity with unit conversions (e.g., Celsius to Kelvin)
  • Basic principles of buoyancy and gas behavior under pressure
NEXT STEPS
  • Review the combined gas law and its applications in real-world scenarios
  • Study hydrostatic pressure calculations in fluid mechanics
  • Learn about unit conversions, particularly between Celsius and Kelvin
  • Explore buoyancy principles and their effects on gas volume in liquids
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Students in physics or engineering, educators teaching gas laws, and anyone interested in fluid dynamics and buoyancy effects in aquatic environments.

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Homework Statement



A 1-cm3 air bubble at a depth of 141 meters and at a temperature of 4 degrees Celsius rises to the surface of the lake where the temperature is 13.1 degrees Celsius, to the nearest tenth of a cm3, what is its new volume?

Homework Equations



P1V1/T1=P2V2/T2

The Attempt at a Solution



I have trying to use previous posts to help me, but I do not know where I am going wrong. I attempted using these numbers.

((1.013x105)+(1000x9.8x141)(1)(286.25))/(1.013x102)(277.15)

However, I don't know if I am supposed to use (1.013x105) or 1000 because they are not given in the original problem.
 
Last edited:
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Please work with units, that makes things much easier. It looks like the brackets are wrong - something easy to spot if you work with units as they won't match there.

I guess the 102 in the denominator is a typo?

I think it does not matter which surface pressure you use, as long as you make it clear what you use. The effect is small and I guess for the rounded result both choices give the same value.
 
The P2 value is incorrect.
 

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