Pressure units

Pascal ($Pa$)

1 $Pa$ is the pressure exerted by a force of 1 Newton ($ 1 \; N $) on a surface of $1\:m^2$

Bar ($bar$)

$1\;bar$=$10^5 \;Pa$

Atmosphere ($atm$)

$1\;atm$=$1.0133 \;bar$

Millimeter of mercury = torr ($1mmHg=1torr$)

$760\;mmHg=760\;torr=1\;atm$