When using a mercury barometer , the vapor pressure of mercury is usually assumed to be zero. At room temperature mercury’s vapor pressure i

Question

When using a mercury barometer , the vapor pressure of mercury is usually assumed to be zero. At room temperature mercury’s vapor pressure is about 0.0015 mm-Hg. At sea level, the height hhh of mercury in a barometer is about 760 mm.Required:a. If the vapor pressure of mercury is neglected, is the true atmospheric pressure greater or less than the value read from the barometer? b. What is the percent error? c. What is the percent error if you use a water barometer and ignore water’s saturated vapor pressure at STP?

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Thu Giang 4 years 2021-08-22T10:05:09+00:00 1 Answers 21 views 0

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  1. dangkhoa
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    2021-08-22T10:06:13+00:00
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    Answer:

    Explanation:

    (a)

    The true atmospheric pressure will has more value than the reading in the barometer. If Parm is the atmospheric

    pressure in the tube then the resulting vapour pressure is

    Patm – pgh = Prapor

    The final reading ion the barometer is

    pgh = Palm – Proper

    Hence, the true atmospheric pressure is greater.

    you can find the answer in this book

    physics principles with Applications, Global Edition Problem 67P: Chapter: CH 13 Problem:67p

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