Question

Consider the following statements.
1. SI unit of atmospheric pressure is $N{m}^{-2}$ or pascal and CGS unit is dyne/$c{m}^2$.
2. The barometer is a device by which the atmospheric pressure is measured.
3. The standard atmospheric pressure is the pressure required of 76 cm of Hg column or 760 mm of Hg column, which is equivalent to 1 atm.
Which of the statements given above is/are correct?

• A. 1 and 2
• B. Only 1
• C. 2 and 3
• D. 1, 2 and 3

Answer 1

The correct option is D 1, 2 and 3

1. Pressure is measured in $N/m^2$ in SI units and $dyne/c{m}^2$ in CGS.

2. To measure the atmospheric pressure, barometer is used.

3. The standard atmospheric pressure of 1atm is equivalent to fluid pressure due to 76cm or 760mm of Hg column in a tube.

All statements are correct.