define weather ,atmosphere and air pressure
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Answer:
Let's look at air pressure first. Though you can't see them, air is a cocktail of molecules that fly around and bump into each other. Think of the molecules as billiard balls - as they bump into each other, they push each other around. You aren't going to notice one molecule bumping into another one, but if you add up all these tiny collisions and pushes, you might start to feel it! Those molecules also have weight, and between the weight of the air pushing down and the collisions between molecules, we get air pressure.
Atmospheric pressure
WRITTEN BY: The Editors of Encyclopaedia Britannica
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Alternative Titles: air pressure, barometric pressure
Atmospheric pressure, also called barometric pressure, force per unit area exerted by an atmospheric column (that is, the entire body of air above the specified area). Atmospheric pressure can be measured with a mercury barometer (hence the commonly used synonym barometric pressure), which indicates the height of a column of mercury that exactly balances the weight of the column of atmosphere over the barometer. Atmospheric pressure is also measured using an aneroid barometer, in which the sensing element is one or more hollow, partially evacuated, corrugated metal disks supported against collapse by an inside or outside spring; the change in the shape of the disk with changing pressure can be recorded using a pen arm and a clock-driven revolving drum.
Weather is the mix of events that happen each day in our atmosphere. Weather is different in different parts of the world and changes over minutes, hours, days and weeks. Most weather happens in the troposphere, the part of Earth’s atmosphere that is closest to the ground.
Answer:
Atmospheric pressure: Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. ... In most circumstances, atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point.