Explain how is the height of mercury column in the tube of a simple barometer, a measure of the atmospheric pressure.

Why mercury is used in barometer for measuring atmospheric pressure?

Which instrument is used to measure atmospheric pressure ?

The vertical height of mercury which a simple barometer can support at sea level is:

A barometer is constructed with its tube having radius 1.0 mm. Assume that the surface of mercury in the tube is spherical in shape. If the atmospheric pressure is equal to 76 cm of mercury, what will be the height raised in the barometer tube? The contact angle of mercury with glass 135^@ and surface tension of mercury =0.466Nm^-1 . Density of mercury =13600kgm^-3 .

The vertical height of mercury in a simple barometer is dependant on the area of cross-section of barometer tube.

Illustrate with the help of a lebelled diagram of a simple barometer that the atmospheric pressure at a place is 76 cm of Hg.

A vertical tube of length 100 cm contains a mercury pallet of length 5 cm as shown in the figure. The length of the tube above mercury pallet if the tube is inverted is nearly: (atmospheric pressure = 75 cm Hg of Hg)

Explain why does the mercury level in a barometer go down when atmospheric pressure decreases?

The space above the mercury in a simple barometer is called :

Mention two demerits of a simple barometer and state how they are removed in a Fortin barometer.