By: Clay Collins, E land Anthony, and Andrew Carney. High and Low Pressure. What Is Air Pressure ? . Air pressure is the downward pressure applied by the weight of the atmosphere. High and Low Pressure.
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Air pressure is the downward pressure applied by the weight of the atmosphere.
Low pressure forms clouds, this is because the water vapor in low pressure condenses into clouds. Low pressure can also cause hurricanes. Low pressure areas exist because air is rising, leaving less pressure behind.
A barometer is used to measure air pressure.
This instrument was invented in 1643 by the Italian scientist named Evangelista Torricelli. The mercurial barometer is a glass tube sealed at one end and filled with pure mercury. The mercury in the tube sinks a little bit, creating something that is like a vacuum. This is called the Torricellian vacuum.
High and low pressure affects weather by causing weather to change depending on the pressure. When there's high pressure in the air, it leads to a sunny day with no clouds. When there is low pressure, then it leads to cloudy and or rainy days. The definition of air pressure is the downward pressure applied by the weight of the atmosphere.