Millibars-Unit of atmospheric pressure. Other possible units of pressure used by scientists are inches of Mercury, and torr.
To convert millibars (mb) to inches of mercury (in Hg), divide the millibar reading by 33.86:
in Hg = mb / 33.
It is determined by lifting an air parcel to 500 millibars and then comparing its temperature to that of the environment. If the parcel is colder than its new environment, then the atmosphere is more stable.
- The temperature a parcel of air would have if
a) it was lifted until it became saturated,
b) all water vapor was condensed out, and
c) it was returned adiabatically (i.e., without transfer of heat or mass) to a pressure of 1000 millibars.
Bar A unit of pressure equal to 106 dyne per cm² (106 barye), 1000 millibars, 29.53 inches of mercury. Barogram The record of a barograph. Barograph A continuous-recording barometer.
Centibar The pressure unit of the meter-ton-second system of physical units, equal to 10 millibars or 104 dynes per cm². Centigrade temperature scale The older name for the Celsius temperature scale.
In aviation weather reports (METAR), QNH is transmitted around the world in millibars or hectopascals, except in the United States and Canada where it is reported in inches of mercury.
27: How do I convert millibars to inches etc?
Section 2B:( Background and special topics. )
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Section 3: Questions relating to sources of information.
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Section 4: Pointers to other sources of information.
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Pressure is usually measured in millibars, 1 mb = 103 dyne/cm2. Distance is conveniently measured in the length of a degree of latitude, which is 111 km or 69 mi. Then, a pressure gradient of 1 mb per degree of latitude is 8.993 x 10-5 dyne/cm2/cm.
Inches To Millibars... Mile To Knots... Coriolis Force... Cross Section Of The Atmosphere... Doppler Effect... Earth's Speed... Electromagnetic Waves... F Scale... Flying Weather/IFR/VFR... Gradient/Geostrophic Winds... Heating Degree Days...
upper-air weather chartWeather maps that are produced for the portion of the atmosphere above the lower troposphere, generally at and above 850 millibars.
BNBlowing SandBNDRYBoundaryBombPopular expression of a rapid intensification of a cyclone (low pressure) with surface pressure expected to fall by at least 24 millibars in 24 hour.
The layer most often used in meteorology is between 1000 and 500 millibars.
2 millibars (mb), dew will form when the ground reaches 45 degrees Fahrenheit (F). The relative humidity for air containing 10.2 mb of water vapor is simply 100% times 10.2 mb divided by the saturation vapor pressure at the actual temperature.
MB: An acronym for Millibars. See Millibars.
MCC: An acronym for Mesoscale Convective Complex. See Mesoscale Convective Complex.
MCD: An acronym for Mesoscale Discussion. See Mesoscale Discussion.
Air pressure is usually measured in millibars or in inches of mercury. Mercury in the tube adjusts until the weight of the mercury column balances the atmospheric force exerted on the reservoir.
CONDENSATION PRESSURE DEFICIT (COND PRES DEF)- On an isentropic chart (a layer of constant potential temperature), condensation pressure deficit represents the amount of lift, expressed in millibars, needed to saturate an air parcel.
MB An acronym for millibars.
MCC An acronym for Mesoscale Convective Complex.
MCD An acronym for Mesoscale Discussion.
Kilopascal- A metric unit of air pressure. It is simply millibars divided by 10.
Latent Heat- The energy that is stored when water evaporates. This energy is released when water condenses as a liquid or ice.
LIFTED INDEX- The environmental temperature at 500 millibars minus the 500 millibar parcel temperature on a Skew-T diagram. Negative LI values are unstable.
LIGHTNING An electrical discharge from a thunderstorm.
A measure of the mass of air above a given point. Usually expressed in millibars (mb) or hectopascals (hPa). Also known as atmospheric or barometric pressure (pressure measured by a barometer).
Albedo ...
86 millibars or 25.40 millimeters. First devised in 1644 by Evangelista Torricelli (1608-1647), an Italian physicist and mathematician, to explain the fundamental principles of hydromechanics. Related term: barometric pressure ...
Standard atmospheric pressure A pressure of 1013.26 millibars (mb), 29.92 inches of mercury (Hg), 760 millimeters (mm) of mercury, 14.7 pounds per square inch (lb/in.2), 101,326 pascals (Pa).
Air density
Mass per unit volume of air; about 1.275 km per cubic meter at 0ēC and 1000 millibars.
Air mass
A large expanse of air having similar temperature and humidity at any given height.
The pressure exerted by the atmosphere at a given point. Its measurement can be expressed in several ways. One is in millibars. Another is in inches or millimeters of mercury (Hg).
Related term: barometric pressure
AURORA ...
MILLIBAR: A unit of atmospheric pressure. 1 mb = 100 Pa (pascal). Normal surface pressure is approximately 1013 millibars.
MONSOON: A persistent seasonal wind, often responsible for seasonal precipitation regime.
BAROMETER - Instrument used to measure the pressure of the air. Common units are MILLIBARS (MB) and INCHES of mercury (IN/Hg).
PRESSURE: The force exerted by the weight of air above a given point, usually expressed in millibars (mb) or inches of mercury (in. Hg).
Kilopascal - The internationally recognized unit for measuring atmospheric pressure. It is equal to 10 millibars.
Knot- A measure of speed. It is one nautical mile per hour (1.15 mph).
Millibar. The metric measurement of air pressure. A millibar is 1000 dynes per square centimeter, or 100 pascal (Pa). Surface pressure averages around 1013 millibars.
Weather Glossary Search Page
Weather Glossary Source List ...
Barometer - An instrument used to measure air pressure. The international standard of measurement is the kilopascal although millibars and inches of mercury are also commonly used.
A surface temperature of 59° F (15° C) and a surface pressure of 29.92 inches of mercury (1013.2 millibars) at sea level;
A lapse rate in the troposphere of 6.5° C per kilometer (approximately 2° C per 1,000 feet); ...
Standard Atmospheric Pressure - the pressure exerted by a 760 millimeter column of mercury at sea level at a temperature of 0 degrees Celsius; equal to 1013.25 millibars (mb), 29.92 inches of mercury (in of Hg), or 14.7 pounds per square inch ...
Bomb Cyclone - An extratropical area of low pressure in which the central pressure drops at least 24 millibars in 24 hours.
 See also: Millibar, Pressure, Weather, Surface, Temperature
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