Measurement of vacuum: so, till now we saw atmospheric pressure, total pressure. So now, we have gone into a measurement of vacuum. So, in measurement of vacuum, pressure below atmosphere is generally termed as low pressure or vacuum pressure, below the atmosphere. When the term vacuum is mentioned, it means that that the gauge pressure is negative, this is very important. So, when the gauge pressure is negative it is called as vacuum; however, atmospheric pressure serves as a reference and absolute pressure is positive. Low pressure or more difficult to measure than medium pressure; so, anything which is higher in pressure it is easy, if you want to go this is atmospheric pressure, anything lower than that is always a difficult. McLeod gauge which is also known as the compression gauge is used for vacuum measurement, by compressing the low-pressure gas whose pressure is to be measured. The trapped gas gets compressed in a capillary tube the vacuum is measured by measuring the height of the column of mercury.

Hima Xavier

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