Question

Which one of the following pressure units represents the LEAST pressure ?

• A. millibar
• B. mm of Hg
• C. N/m$m^2$
• D. kgf/c$m^2$

Answer 1

The correct option is A millibar

1 atm = 10.1 m of water
= 760 mm of Hg
= 1013 millibar
= 101.3 kPa
$=1.013kgf/c{m}^2$
$=0.1013N/m{m}^2\left(MPa\right)$

$1millibar=\frac{1}{1013}atm$

$1mmofHg=\frac{1}{760}atm$

$1N/m{m}^2=\frac{1}{0.1013}atm$

$1kgf/c{m}^2=\frac{1}{1.013}atm$

From the above relation, it is clear that

${\text{1 millibar < 1 mm Hg < 1 kgf/cm}}^2{\text{< 1 N/mm}}^2$