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Millibars are a unit of pressure used in meteorology, with one millibar equaling one thousandth of a bar. The standard pressure at sea level is approximately 1.013 millibars, and changes in air pressure can indicate weather patterns. Millibars are rarely used outside of meteorology, but can be seen in weather reports and safety classes for outdoor workers.
A millibar is a unit of pressure that is most commonly seen in the context of meteorology, where atmospheric pressure is sometimes expressed in millibars. As the name suggests, one millibar equals one thousandth of a bar. The bar is a unit of measurement introduced in the early 1900s, based on a measurement system using dynes. Dynes are part of the now obsolete centimeter-gram-second (CGS) measurement system.
Measurements can be a little confusing. Several conflicting systems of measurement are currently in use, and sometimes nations using one official system may periodically refer to another, further adding to the confusion. Millibars are widely accepted as a unit of measurement in meteorology, but are rarely seen outside of this field. Bars and the related system of pascals are closely related, and sometimes used interchangeably, with a single hectopascal being equivalent to a millibar.
At sea level, the standard pressure is approximately 1.013 millibars. Atmospheric pressure decreases as people go up in altitude and gets higher as people go below sea level. The rates of rise and fall are fairly stable, and there are calculations that can be used to plot atmospheric pressure shifts and to determine the pressure at a known altitude, the millibar being a unit of measure that can be used in such a way. calculations. As many people know, moving too quickly between areas of high and low pressure can be dangerous, as the body may not be able to adjust quickly enough.
Local changes in air pressure occur in response to weather systems moving across the earth’s surface. When meteorologists provide weather reports, they provide information about air pressure in millibars that people can use to learn more about the weather in the coming days. If the pressure rises, the weather should be fine, while pressure drops indicate that storm systems are on their way. Rapid fluctuations in air pressure can be warning signs that a storm system is approaching.
One place where millibars can be seen is in a weather report on the news or in the newspaper. Sometimes, the journalist gives the measurement in hectopascal, abbreviated to hPa, and it can be useful to remember that the terms “millibar” and “hectopascal” are equivalent. The term can also be seen in textbooks dealing with weather issues and can come up in safety classes for people who work outdoors and are therefore vulnerable to changes in the weather. Boaters, for example, need to be aware of changes in atmospheric pressure and good at reading weather reports for safety reasons.
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