Explain briefly about a simple barometer.

Barometer-

Mercury Barometer was invented by Torricelli and it is a device used for measuring pressure.

Below is a figure showing the  Mercury Barometer device

From the figure we can say that

At Point C only atmospheric pressure is there.

So $P_C=P_0$

Ans since B and C are at the same horizontal level

So $P_C=P_B=P_A+\rho gh=0+\rho gh=\rho gh=P_0=Atmospheric \ pressure$

For mercury barometer h=76 cm and

And using $\rho =13.6*10^3 kg/m^3$

We get $P_0=1.013*10^5 N/m^2=1 \ atm= 76 \ cm \ of \ Hg$

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