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BarlowGirl Group Title

PLEASE HELP!!! Could a thermometer be used to measure the pressure inside a helium-filled weather balloon?

  • 2 years ago
  • 2 years ago

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  1. Kryten Group Title
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    why not?!

    • 2 years ago
  2. BarlowGirl Group Title
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    Well, that's what I was thinking, but would it be more reasonable to measure it with a barometer?

    • 2 years ago
  3. Kryten Group Title
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    well yes, but you can also use thermometer...

    • 2 years ago
  4. BarlowGirl Group Title
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    Which do you think would be the best?

    • 2 years ago
  5. BarlowGirl Group Title
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    Barometer or thermometer?

    • 2 years ago
  6. Kryten Group Title
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    well barometer would be better of course...

    • 2 years ago
  7. BarlowGirl Group Title
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    What I'm wondering, though, is how would you get a balloon over the top of a barometer? Isn't a barometer supposed to be inverted, so that the liquid mercury pushes up into the tube?

    • 2 years ago
  8. Kryten Group Title
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    barometers if i remember correct are filled with some liquids and are compleatly full

    • 2 years ago
  9. .Sam. Group Title
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    The barometer looks like this |dw:1339117085144:dw| The inverted tube contains a space of vacuum which will be filled if the outside pressure is high. Atmospheric pressure pushes the mercury down as shown in arrow , them it pushes up the tube. The mercury goes up because that's the place which requires less force to be occupied because its vacuum. If the atmospheric pressure is high, the mercury column will be long, and vice versa.

    • 2 years ago
  10. BarlowGirl Group Title
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    Okay, I do understand that, but what do you think of measuring the pressure inside the balloon with a barometer? Do you think that sounds reasonable, or do you think it would be better with a thermometer?

    • 2 years ago
  11. Kryten Group Title
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    yes sorry i meant membrane manometer...

    • 2 years ago
  12. .Sam. Group Title
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    I don't think you can measure the pressure inside the balloon because it depends on the elasticity of the rubber.

    • 2 years ago
  13. BarlowGirl Group Title
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    Yes, I agree, as well. Don't worry - I'm not actually going to try this - this is one of the questions from my chemistry course.

    • 2 years ago
  14. BarlowGirl Group Title
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    @.Sam. - which do you think would be reasonable - measuring the pressure with a thermometer or a barometer? I guess we'll have to "think outside the box," for this question.

    • 2 years ago
  15. .Sam. Group Title
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    oh its a helium filled balloon, helium is the most ideal gas in the periodic table, you could use PV=nRT to calculate pressure , which means that you can use a thermometer to find the change in temperature

    • 2 years ago
  16. BarlowGirl Group Title
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    Aha! That's exactly what I thought! But, just in case the barometer is the right answer, is there any way that you could measure the pressure inside the balloon, with a barometer?

    • 2 years ago
  17. .Sam. Group Title
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    no others unless you put the barometer inside the balloon

    • 2 years ago
  18. BarlowGirl Group Title
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    Great! - that's exactly my thinking! Thank you very much - you've been so helpful! =) I really do appreciate it!

    • 2 years ago
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