Question

The reading in a barometer containing spme air above the mercury column is 73 cm while that of correct one is 76xm

Answer 1

Given:

The mercury column is 73 cm.

The correct one is 76 cm.

To find:

The value of H of the pressure of mercury.

Solution:

The pressure on he body is

P'=(76-73)

P'=3 cm of mercury.

The volume is

V=A×(90-76)

V=A×14

Now the P"

P"=(H-73)

The volume of the system is

V'=A×(90-73)

V'=A×(17)

Applying the Boyle's Law

P'V=P"V'

Putting the values above we get

We get the value of H is 75.47 cm