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millibar是什么意思，millibar翻译
Millibar: A Measure of Atmospheric Pressure
The millibar (mbar) is a unit of measurement for atmospheric pressure. It is a metric unit that is commonly used to express the force per unit area exerted by the Earth's atmosphere. One millibar is equal to one hundredth of a bar, which is a unit of pressure equal to one million dynes per square centimeter. The millibar is also equivalent to ten kilopascals (kPa), as one kilopascal is equal to one hundred dynes per square centimeter.
The concept of measuring atmospheric pressure can be traced back to the late 1600s, when the Italian physicist Evangelista Torricelli invented the barometer. The barometer is a device that measures the height of a column of mercury in a glass tube, which is inversely proportional to the atmospheric pressure. As the atmospheric pressure increases, the height of the mercury column decreases, and vice versa. The unit of measurement for atmospheric pressure was originally the bar, but as metric system gained popularity, the millibar became the preferred unit for expressing atmospheric pressure.
Atmospheric pressure is affected by a variety of factors, including temperature, altitude, and weather conditions. For example, as temperature increases, the atmospheric pressure tends to decrease, and as altitude increases, the atmospheric pressure tends to decrease as well. The millibar can be used to monitor these changes in atmospheric pressure, which can be important for weather forecasting and other applications.
In addition to weather forecasting, the millibar is also used in a variety of other fields. For example, in the field of aviation, pilots use millibar measurements to monitor changes in atmospheric pressure during flights. In the field of medicine, millibar measurements are used to monitor the pressure in the lungs of patients with respiratory conditions. The millibar is also used in the field of geophysics to monitor changes in atmospheric pressure that can be associated with earthquakes and other geological phenomena.
It is important to note that the millibar is a unit of measurement for atmospheric pressure, and should not be confused with other units of pressure, such as the psi (pounds per square inch) or the cmHg (centimeters of mercury). These units are used to measure different types of pressure, and are not equivalent to the millibar.
In conclusion, the millibar is a unit of measurement for atmospheric pressure that is commonly used in weather forecasting and other fields. It is a metric unit that is based on the bar and is equal to ten kilopascals. The millibar is affected by factors such as temperature, altitude, and weather conditions, and can be used to monitor changes in atmospheric pressure that can be important for various applications.