Barometric pressure at sea level is _______?
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Answer: B. 760 mm
Explanation
Standard atmospheric barometric pressure at sea level is defined precisely as 760 millimeters of mercury. This benchmark measurement equals one standard atmosphere of pressure exerted by the Earth's air column. Meteorologists use this standard value as a baseline reference for weather forecasting and aviation calculations. Barometers are scientific instruments used to measure atmospheric pressure changes associated with weather systems. Evangelista Torricelli invented the mercury barometer in the seventeenth century using a column of liquid mercury. Pressure decreases with increasing altitude because there is less overlying air pressing down from above.
High barometric pressure typically indicates clear, calm weather conditions in local atmospheric regions. Aviation altimeters rely on barometric pressure measurements to determine an aircraft's height above sea level. Standard sea level pressure is also equivalent to 1013.25 millibars in meteorological measurement units. 746 mm is an incorrect numerical value that does not correspond to standard atmospheric sea level pressure. 820 mm exceeds standard sea level barometric pressure readings recorded under normal meteorological conditions. None of these is incorrect because the correct standard value of 760 millimeters is provided.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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