Manometer Problem: 18 mm Hg Measurement

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In summary, a closed-end manometer is used to measure the pressure of a gas sample. The difference in height between the closed and sample sides of the manometer is 18 mm, which can be used to determine the pressure in mmHg. However, since the atmospheric pressure is given in kilo-pascals, the conversion will need to be made to determine the gas pressure in kPa.
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Speedking96
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Homework Statement



A closed-end manometer is used to measure the pressure of a sample of a given gas. The level of mercury (Hg) is 18 mm higher in the part of the tube connected to the sample than in the other part. Determine the gas pressure in kilo-pascals, if the atmospheric pressure is 99.7 kPa.


Homework Equations



For a closed-end manometer, it is my understanding, and perhaps I am wrong, that the atmospheric pressure does not matter. Rather, you would only measure the difference in height (closed - sample) and that would be the pressure in mmHg.

So, I don't understand how the sample side could be 18 mm higher.
 
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I concur with you. Probably a simple mistake, should be "open-ended."
 

1. How do you measure 18 mm Hg with a manometer?

The first step in measuring 18 mm Hg with a manometer is to make sure the instrument is properly calibrated. Then, fill one side of the manometer with a liquid, such as mercury or water, and connect the other side to the system being measured. The liquid levels should balance out and the height of the column of liquid in the manometer can be read to determine the pressure, in this case 18 mm Hg.

2. What is the purpose of using a manometer in scientific experiments?

A manometer is used to measure pressure, which is an important factor in many scientific experiments. It can be used to measure the pressure of gases, liquids, and even vacuum systems. In some cases, a manometer can also be used to control pressure by adjusting the levels of the liquid in the column.

3. What factors can affect the accuracy of a manometer measurement?

The accuracy of a manometer measurement can be affected by several factors, including the type and quality of the liquid used, the level of sensitivity of the instrument, and any external factors that may cause changes in pressure, such as temperature or altitude. It is important to carefully calibrate and maintain a manometer to ensure accurate measurements.

4. Can a manometer be used to measure pressure in all types of systems?

No, a manometer may not be suitable for measuring pressure in all types of systems. For example, it may not be able to accurately measure pressure in systems with high levels of turbulence or those containing corrosive or viscous substances. In these cases, alternative methods of pressure measurement should be used.

5. How is the measurement of 18 mm Hg significant in scientific research?

The measurement of 18 mm Hg may be significant in specific scientific research that involves pressure measurements. For example, it could be used to determine the pressure of a gas in a controlled environment or to measure the pressure difference between two points in a system. It is important to accurately measure and record pressure in scientific research to ensure the validity and reproducibility of results.

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