Question

Question :

A simple barometer tube contains some air in it. The length of the tube above the mercury level in the trough is 80 cm. The hieght of the mercury in the the tube is 71 cm at normal atmospheric pressure. What is the actual decrease in the Atmospheric pressure if the barometer reads 65 cm.

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Answer 1

✪ QUESTION ✪

A simple barometer tube contains some air in it. The length of the tube above the mercury level in the trough is 80 cm. The height of the mercury in the the tube is 71 cm at normal atmospheric pressure. What is the actual decrease in the Atmospheric pressure if the barometer reads 65 cm.

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Suppose A be the area of the cross-section.

$\implies \bf\red{V_1 = \bigg(90 - 74.8 \bigg)A } \\ \\ \quad \bf \red{ = 15.2A \: {cm}^{3} }$

$\implies \bf \red{P_1 = 76 - 74.8} \\ \\ \quad \bf \red{ = 1.2 \: cm \: of \:Hg }$

$\implies \bf \red{ \bigg(P_2 = P- 75.4 \bigg) \: cm \: of \:Hg }$

$\implies \bf\red{V_1 = \bigg(90 - 75.4 \bigg)A } \\ \\ \quad \bf \red{ = 14.6A \: {cm}^{3} }$

$\quad \quad \bf \red{ \dfrac{ P_1V_1}{T_1}} \\ \\ \bf \red{ = \dfrac{P_2V_2}{T_2}} \\ \\ \bf \red{ = \dfrac{1.2 \times 15.2 \times 283}{303 \times 14.6} } \\ \\ \bf \red{ = 75.4 + 1.17} \\ \\ \bf \pink{ = 76.57 \: cm \: of \:Hg \: \green \bigstar }$

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Answer 2

Answer:

this is the answer of ur question..

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