Which of the following is true if the mercury level is the same on both sides of the J tube in a manometer?
A) The gas pressure is higher than the atmospheric pressure.
B) The gas pressure is lower than the atmospheric pressure.
C) The gas pressure is equal to the atmospheric pressure.
D) The volume of the gas is directly proportional to atmospheric pressure.

Question

Quizplus · Accepted Answer

If the mercury level is the same on both sides of the J tube, it means that the pressure of the gas being measured is equal to the pressure of the atmosphere. This is because the pressure of the gas is balanced by the weight of the mercury column in the other arm of the manometer, which is in contact with the atmosphere. Therefore, choice C is correct. Choices A, B, and D are incorrect.

Which of the Following Is True If the Mercury Level