A student measures pressure of a gas in a container using a mercury manometer and she also measu...

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A student measures pressure of a gas in a container using a mercury manometer and she also measures atmospheric pressure using a mercury barometer. She gave following representation
If \( p_{1}= \) atmospheric pressure,
and \( p_{2}= \) absolute pressure, then
(a) gauge pressure \( =h_{1}+h_{2} \) (b) gauge pressure \( =h_{3}-h_{1} \)
(c) gauge pressure \( =h_{3} \)
(d) absolute pressure \( =h_{1} \)
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