What unit is mtorr?

Mb=mbar millibar (= hectopascals), hPa hectopascals 1 hectopascals = 1 millibar =3/4 mm Hg.

However, in other fields, hecto prefix representing one hundred is rarely used, so kilopascals are usually used instead. For example, the weather forecast in Canada is usually in kilopascals. Millibar is usually used to refer to hurricanes or tornadoes, because lower central air pressure means higher wind speed and more power.

Application:

Millibar is a physical unit used to measure pressure. Millibar is not an international unit. The unit of SI is Pascal (Pa),1mbar =100pa =1HPA = 0.1kpa, but millibar is still a common unit in many occasions.

For a long time, meteorologists all over the world have regarded millibar as one of many units for measuring the atmosphere. It will take some time for Sl units to be widely adopted. Millibar is still widely used, although officials in various countries are gradually transitioning to the Sl unit with the same number: hPa.