Everyone knows that air pressure is measured in millimeters of mercury, since this unit of measure is used in everyday life. In physics, in the SI system of units, pressure is measured in pascals. An article on how to translate millimeters of mercury into pascals.
Air pressure
To begin with, we will 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: to do this, remember that each body of finite mass has a certain weight, which can be determined by the formula: N = m * g, where N is the body weight, g is the gravitational acceleration, m is the body mass . The presence of body weight is due to gravity.
The atmosphere of our planet is a large gaseous body, which also has some mass, and therefore has weight. It was experimentally established that the mass of air that exerts pressure on 1 m 2 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).
Pascal millimeters of mercury conversion
When viewing a weather forecast, atmospheric pressure information is usually presented in millimeters of mercury (mmHg). To understand how mm Hg. Art. translate into pascals, you only need to know the ratio between these units. And remember this ratio is simple: 760 mm RT. Art. corresponds to a pressure of 101 325 Pa.
Knowing the above numbers, you can get the translation formula in pascal millimeters of mercury. The easiest way to do this is to use a simple proportion. For example, some pressure H is known in mmHg. Art., then the pressure P in pascals will be equal to: P = H * 101325/760 = 133.322 * H.
The above formula is easy to use. For example, on the top of Mount Elbrus (5642 m), the air pressure is approximately 368 mm Hg. Art. Substituting this value into the formula, we obtain: P = 133.322 * H = 133.322 * 368 = 49062 Pa, or approximately 49 kPa.