The atmospheric pressure

The atmospheric pressure can be estimated if a glass bottle filled with the water. Pinch the hole with your fingers and dip the neck of the bottle into the water. Then open the neck of the bottle by taking away his fingers. The atmospheric pressure will support a column of water in the bottle. It drives the water in a bottle.

What is equal to the atmospheric pressure?

Italian scientist Torricelli (17th century) proved that the atmospheric pressure balances of the mercury pressure of approximately 760 mm (at 0 degrees Celsius). Such pressure agreed to call normal.

Normal atmospheric pressure is equal to 1,0336 kg per cm². At 00C and normal atmospheric pressure of 1 m³ air weighs 1,3 kg.

As you can see, the air – it is a great strength. In no case can not be considered void the air, environment, "where there is nothing".

On the surface of Earth's the atmospheric pressure varies over time and by location. Especially it is important aperiodic changes that determine the weather. They are associated with the origin, development and destruction of the slow-moving areas of high pressure (anticyclones) and relatively fast-moving huge vortices (cyclones) in which negative pressure prevails.

In addition, the atmospheric pressure decreases with increasing of the altitude.

In the maps show the atmospheric pressure with the help of isobars. This are contour lines that connect its points with the same value.