As you was standing in the center of a playground or when you room sitting in your class, over there is an tremendous weight appropriate over your head, but you carry out not feeling it! This is the weight of the atmosphere, or air, as we recognize it.

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Composed of nitrogen, oxygen, carbon dioxide and other gases, it surrounding the planet like one envelope. And, the extends almost a thousands kilometres above the Earth’s surface.

Like all various other substances, air also has weight. Imagine, we are actually talking about a thousand-kilometre high tower of air over our heads. This is well-known as the atmospheric pressure.

Barometer steps atmospheric pressure

Why don’t our bones gain crushed under this weight?

Actually, ours bodies have an interior pressure, i beg your pardon counters the of the atmospheric press and, in the process, balances the out. This internal pressure is important for our survival.

A tiny change in the atmospheric pressure deserve to make us feel sick. This is the factor why mountaineers acquire sick at high altitudes. Together we go higher, the air becomes thin and also hence, the atmospheric pressure also decreases.

How is that measured?

What is the load of Air?

It is measured together weight of the setting for a given area. Or, the lot of load on a tiny area, such together a centimetre. In 1643, Evangelista Torricelli, one Italian mathematician, invented an tool to measure atmospheric pressure. That is referred to as the barometer.

A barometer consists of an empty tube from i beg your pardon air has been bring away out. This tube is inverted into a food of mercury. Because the food of mercury is based on the press of the air over it, few of the mercury is pushed into the tube.

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The level come which mercury rises is measure in inches and also this indicates the atmospheric pressure. Top top a clear day (clouds and also high winds can change atmospheric pressure), in ~ sea level, mercury rises to a height of 29.792 inch (76 centimetres), in a barometer. This is same to 14.70 pounds (6.6 kilograms) per square customs of area. Hence, at sea level, we carry around 6.6 kilograms of load on every inch of our body.