Forecast bar tnt4/7/2023 Specifically, an increase of 1 decibar occurs for every 1.019716 m increase in depth. In fresh water, there is an approximate numerical equivalence between the change in pressure in decibars and the change in depth from the water surface in metres. In contrast, Americans are familiar with the use of the millibar in US reports of hurricanes and other cyclonic storms. For example, the weather office of Environment Canada uses kilopascals and hectopascals on their weather maps. After the advent of SI units, some meteorologists began using hectopascals (symbol hPa) which are numerically equivalent to millibars for the same reason, the hectopascal is now the standard unit used to express barometric pressures in aviation in most countries. Despite the millibar not being an SI unit, meteorologists and weather reporters worldwide have long measured air pressure in millibars as the values are convenient. Usage Ī tire-pressure gauge displaying bar (outside) and pounds per square inch (inside)Ītmospheric air pressure is often given in millibars, where standard atmospheric pressure is defined as 1013.25 mbar, 101.325 kPa, 1.01325 bar, which is about 14.7 pounds per square inch. Between 17, the word bar was used for a unit of weight in an early version of the metric system. The unit's official symbol is bar the earlier symbol b is now deprecated and conflicts with the use of b denoting the unit barn, but it is still encountered, especially as mb (rather than the proper mbar) to denote the millibar. The word bar has its origin in the Ancient Greek word βάρος ( baros), meaning weight.
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