Problem: A sealed-tube manometer (as shown below) can be used to measure pressures below atmospheric pressure. The tubeabove the mercury is evacuated. When there is a vacuum in the flask, the mercury levels in both arms of the U-tube are equal. If a gaseous sample is introduced into the flask, the mercury levels are different. The difference h is a measure of the pressure of the gas inside the flask. If h is equal to 6.5 cm, calculate the pressure in the flask in torr, pascals, and atmospheres.

🤓 Based on our data, we think this question is relevant for Professor Pelton's class at UMN.

FREE Expert Solution
  • cmHg can be directly converted to torr: 

  • 1 torr = 0.1 cm

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Problem Details

A sealed-tube manometer (as shown below) can be used to measure pressures below atmospheric pressure. The tube
above the mercury is evacuated. When there is a vacuum in the flask, the mercury levels in both arms of the U-tube are equal. If a gaseous sample is introduced into the flask, the mercury levels are different. The difference h is a measure of the pressure of the gas inside the flask. If h is equal to 6.5 cm, calculate the pressure in the flask in torr, pascals, and atmospheres.