What is $1$ Torr pressure? And what is $1$ bar?

(N/A) $1$ Torr is defined as the pressure exerted by a $1 \,mm$ column of mercury.
Using the formula $P = h \rho g$:
$1$ Torr $= (10^{-3} \,m) \times (13.6 \times 10^{3} \,kg/m^{3}) \times (9.8 \,m/s^{2})$
$1$ Torr $\approx 133.3 \,Pa$ (or $N/m^{2}$).
$1$ bar is defined as a unit of pressure equal to $10^{5} \,Pa$ (or $N/m^{2}$).