Mercury is less dense at high temperatures than at low temperatures. Suppose you move a mercury barometer from the cold interior of a tightly sealed refrigerator to outdoors on a hot summer day. You f

Question

Mercury is less dense at high temperatures than at low temperatures. Suppose you move a mercury barometer from the cold interior of a tightly sealed refrigerator to outdoors on a hot summer day. You find that the column of mercury remains at the same height in the tube. Compared to the air pressure inside the refrigerator the air pressure outdoors is (Ignore the very small change in the dimensions of the glass tube due to the temperature change)

Options:

Answer:

B

Solution:

$P = ρ g h$ . With h unchanged and $ρ$ smaller outdoors (hot mercury is less dense), the outdoor air pressure $= ρ_{hot} g h$ is lower than the refrigerator air pressure $= ρ_{cold} g h$ .

TestHub · Accepted Answer

P = ρ g h . With h unchanged and ρ smaller outdoors (hot mercury is less dense), the outdoor air pressure = ρ hot ​ g h is lower than the refrigerator air pressure = ρ cold ​ g h .

Physics - Heat & Thermo Question with Solution | TestHub

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