mm of mercury
The millimeter of mercury (mmHg) is pressure unit traditionally used in meteorology. It is the pressure from a 1 mm column of mercury at 0°C under normal gravity.
bar
Bar is a unit of pressure used in various science and engineering. The bar is a metric unit of pressure defined as 100,000 pascals. Although it is not an SI unit it is widely used due to its convenient size for many applications.