Does the Size of a Manometer Tube Affect Pressure Measurement Accuracy?

  • Thread starter fishingspree2
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In summary, the teacher suggested using a manometer to measure the pressure of a gas in a room. This may result in a change in volume and therefore a change in pressure, but the precision of the measurement depends on the size of the manometer's diameter.
  • #1
fishingspree2
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Hello

The teacher said that one way to measure the pressure of a gas enclosed in a room is to attach a manometer to it, like in that picture:
[PLAIN]http://img842.imageshack.us/img842/3994/manometer.jpg

By doing so, aren't we changing the volume the gas has access to, and thus changing the pressure of the gas?

Thank you very much
 
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  • #2
Yes, there will be volume increase so decrease in pressure in the system. But there is no difference how big the diameter of the tube will be so more precise measurement you will have if the diameter of the tube is small so the increase of volume is small in respect of the volume of the system so you don't take it into account.
 

FAQ: Does the Size of a Manometer Tube Affect Pressure Measurement Accuracy?

What is a manometer and how does it work?

A manometer is a device used to measure pressure, typically in a closed system. It works by comparing the pressure in the system to the pressure of a reference column of liquid, such as mercury or water.

What are the different types of manometers?

There are several types of manometers, including U-tube, inclined, and well-type manometers. Each type has its own advantages and is used for specific applications.

How accurate are manometers?

The accuracy of a manometer depends on various factors, such as the type of manometer, the liquid used, and the skill of the operator. However, most manometers have an accuracy of around 1%.

What are the common uses of manometers?

Manometers are commonly used in industries such as HVAC, automotive, and aerospace to measure pressure in various systems. They are also used in laboratory experiments and medical equipment.

How do I read a manometer?

To read a manometer, you need to locate the reference column of liquid and the pressure column. The difference in the heights of these columns is the pressure being measured. The units of measurement will vary depending on the type of manometer being used.

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