Barometers - general
Barometers are used to measure atmospheric pressure and thus help predict the weather meteorologom. Atmospheric pressure varies with altitude, so the pressure measuring device can also be used to determine the amount. Air has mass and is therefore attracted to the Earth's forces grawitacyjnymi The next layer of the atmosphere pushing on those lying below, and all the stresses exerted on the surface of our planet...

Experience Torricellian
Torricelli made the experience showing how air pressure can counterbalance the pressure of liquid column. He took a glass tube with a length of about 1 meter zasklepił at one end and filled with mercury. Then zatkał tube with your finger, and turned away and put in a small open end of the vessel containing mercury...

Aneroid
In 1843 Italy Lucien Vidi invented an entirely new kind of barometers. Called aneroid, which literally means "without liquid". The simplest form is usually closed aneroidu metal tin filled with air...

Aneroid altimeter as
Most aneroidów generally can not be matched with rtęciowymi barometrami in terms of accuracy of measurement. But they offer another advantage - they are much more durable. Thus, it applies wherever it is required that the device was small and easy to use...

Barografy
Barograph aneroid is usually, but equipped with a mechanism that allows a continuous record of pressure readings. It is used normally when it is necessary to continuously monitor changes in pressure. Instead of advice, the device is fitted on recorder, recording changes in pressure in the form of the curve on the paper tape may be wound on the rotating cylinder...