When any pressure is detected above the absolute zero of pressure, it is labeled as. It is measured using barometer, and it is equal to measuring pressure plus the atmospheric pressure.

Diagram showing absolute pressure, vacuum and gauge

where pgaugeis gauge pressure and patmis atmospheric pressure.

Vacuum Pressure=Atmospheric Pressure-Absolute Pressure

At sea level it is around14.7 pounds per square inch.

Lets see some examples of absolute pressure:

Problem 1:A pressure gauge measures the pgaugereading as 31 psi. If the atmosphere pressure is 14.2 psi. Compute the absolute pressure that corresponds to pgaugereading.

Problem 2:The psia pressure instrument gives the reading as 35.8 psi. If the atmospheric pressure is 15 psi, calculate the corresponding guage pressure.

A spectral line in the spectrum of H atom has a wavenumber of15222.22cm1. The transition responsible for this radiation is (Rydberg constantR=109677cm1)

If the shortest wavelength of the spectral line of H – atom in Lyman series is x, then the longest wavelength of the line in Balmer series ofLi2+is

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