Everyone knows that air pressure is measured in millimeters of mercury, since this unit of measurement is used in everyday life. In physics, in the SI system of units, pressure is measured in pascals. The article will tell you how to convert millimeters of mercury to pascals.
Air pressure
First, let's deal with the question of what air pressure is. This value is understood as the pressure that the atmosphere of our planet exerts on any objects located on the surface of the Earth. It is easy to understand the reason for the appearance of this pressure: for this you need to remember that each body of finite mass has a certain weight, which can be determined by the formula: N \u003d mg, where N is the weight of the body, g is the value of the acceleration of gravity, m is the mass of the body. The presence of weight in the body is due to gravity.
The atmosphere of our planet is a large gaseous body, which also has some mass, and therefore has weight. It has been experimentally established that the massof air, which exerts pressure on 1 m2 of the earth's surface at sea level, is approximately equal to 10 tons! The pressure exerted by this air mass is 101,325 pascals (Pa).
Conversion to pascals of millimeters of mercury
When viewing the weather forecast, information about atmospheric pressure is usually presented in millimeters of a column of mercury (mmHg). To understand how mm Hg. Art. convert to pascals, you only need to know the ratio between these units. And remember this ratio is simple: 760 mm Hg. Art. corresponds to pressure 101 325 Pa.
Knowing the above figures, you can get the formula for converting millimeters of mercury to pascals. The easiest way to do this is to use a simple proportion. For example, some pressure H is known in mm Hg. Art., then the pressure P in pascals will be: P=H101325/760=133, 322H.
The above formula is easy to use. For example, at the top of Mount Elbrus (5642 m), the air pressure is approximately 368 mm Hg. Art. Substituting this value into the formula, we get: P=133, 322H=133, 322368=49062 Pa, or approximately 49 kPa.
