The beginning of Bernoulli // Analysis
The Bernoulli principle
Consider the relationship between the pressure and the charges of kinetic and potential energies of a fluid that circulates inside a tube. The speed of the fluid is affected by the change in the diameter of the tube, so that a narrowing implies an acceleration of the fluid and a change of kinetic energy, in such a way that the liquid increases its kinetic energy.
Domain image source from wikimedia commons .
In such a way that it demonstrates, that the pressure diminishes and lowers the height of the liquid, the fact is that I want to say it that this postulate affirms, which the sum of the pressure multiplied by the change of volume and the kinetic energy, in such a potential way of the liquid it is down, I mention that this fact explains the phenomenon of support of the wings of airships, since, his profile forces that the speed of the air is major in the top perta, from what the kinetic energy diminishes and the pressure is minor that below, which I want to say is that it produces a resultant force, which stays away to the new paragraph or in study.
The beginning of Bernoulli
Let's consider the existing relation between the pressure and the charges of energies kinetics and potential of a fluid, which circulates along the interior of a pipe. The speed of the fluid turns out to be affected by the modification of the diameter of the pipe, from what a tightening implies an acceleration of the fluid and a change of kinetic energy, of such a way of the liquid hastening increases his kinetic energy.
Domain image source from wikimedia commons . 
In such a way that it demonstrates, that the pressure diminishes and lowers the height of the liquid, the fact is that I want to say it that this postulate affirms, which the sum of the pressure multiplied by the change of volume and the kinetic energy, in such a potential way of the liquid it is down, I mention that this fact explains the phenomenon of support of the wings of airships, since, his profile forces that the speed of the air is major in the top perta, from what the kinetic energy diminishes and the pressure is minor that below, which I want to say is that it produces a resultant force, which stays away to the new paragraph or in study.
In his studies experiments, taking a glass pipe apreciadamente of 1 m, which it was closed by an end, the full of mercury and it introduced the pipe for his open end, in a receptacle also with mercury, in such a way that he does not spill, it is it wants to be given to understand with all this, the fact is that the atmospheric pressure balances the pressure, which exercises the column of mercury of 79 cm high, where I separate this one it was called a barometer and it is used for the measurement of the atmospheric pressure, where the space that stays in the top part of the pipe is called gap and Torricelli, but the impressive thing is that it contains steam of mercury.
The pressure at level of sea, atmospheric changes with the climatological situation and with the height, that's why one takes a pressure of reference, in such a way that it is considered to be the level of sea it usually takes, as as atmospheric normal pressure the equivalent one to the produced one, remaining normal, which is equivalent to the produced one by a column of mercury of 76 cm. One usually takes the millimeter of mercury as a measurement of the atmospheric pressure (mmHg), if he thinks it a little the change of pressure is usually small.
Have following one millimeter of mercury it is defined, like the pressure, which he exercises on the fund of a column of mercury of 1 mm, of height to degrees centigrade, in such a way that he exercises a column of 760mm, Hg on the fund meets him, as ambience, of such that another employee for the measurement of pressure unit.
Bibliography.
Physics / Physics for Miguel Nunez - 2002.
Physics / Physics for Romilio Tambutti - 2002.
