what is the difference between oil,mercury and red water on barometer?

Expert Solution

In general, the instrument called barometer is used to measure the atmospheric pressure. The instrument uses the specific fluid and a tube. To determine the atmospheric pressure we generally measured the height coloumn of fluid in the tube above the surface in the container in which that tube is placed. The atmospheric pressure is related as P = . So, if we use the different fluid of different density the Height of cloumn will differ. For the same atmospheric pressure if we use the fluid of Lower density the height should be large so we require a large tube which is quite un-practical. If the tube will insufficient in length the device will not work appreciablly.

For example : The atmospheric pressure is often given as the length of mercury column in a barometer. a pressure of 76 cm of mercury means 1 atm in barometer. This height will change for different fluid.

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genius_generous answered 7 months ago

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