millibar
Meaning
A unit of atmospheric pressure equal to one thousandth of a bar.
Structure
Usage
The weather report indicated a pressure drop of ten millibars overnight.
Standard atmospheric pressure at sea level is approximately 1013 millibars.
Meteorologists often use millibars when analyzing pressure systems on weather maps.
Etymology
The word 'millibar' is a modern scientific compound formed in the late 19th century. It combines the metric prefix 'milli-', derived from the Latin word for 'thousand', with the unit 'bar', which originates from the Greek word for 'weight' or 'pressure'. The term was created to provide a convenient, decimal-based unit for measuring atmospheric pressure, where one millibar represents a pressure of one thousandth of a standard bar. This logical construction reflects the systematic nature of scientific nomenclature, building precise terminology from classical roots.
Analysis
- milli: From Latin mille (thousand). A prefix in the metric system denoting a factor of one thousandth. - bar: From Greek baros (weight). A unit of pressure defined as 100,000 pascals.