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Elevation above sea level - in feet and meter - with barometric and atmospheric pressure - <i>inches mercury, psia, kg/cm<sup>2</sup> and kPa</i>.
Interactive atmospheric pressure map. ICON and GFS models. Shows global forecasted mean sea-level pressure.
Atmospheric pressure is the force per unit area exerted by a body of air above a specified area (called an atmospheric column). It is expressed in several different systems of units, including millimeters (or inches) of mercury, pounds per square inch (psi), millibars (mb), or standard atmospheres.
Online calculator, figures and tables showing density, specific weight and thermal expansion coefficients of air at temperatures ranging -100 to 1600 °C (-140 to 2900 °F) at atmospheric and higher pressure - Imperial and SI Units.
This web app graphs the barometric pressure forecast and history of any location, along with relevant current weather data such as temperature, humidity and wind.
The average pressure at mean sea level in the International Standard Atmosphere is 1,013.25 hPa, or 1 atmosphere (atm), or 29.92 inches of mercury. Pressure (P), mass (m), and acceleration due to gravity (g) are related by P = F/A = (m*g)/A, where A is the surface area.
Atmospheric pressure or barometric pressure is the pressure within the atmosphere of Earth. For most purposes it can be approximated by the hydrostatic pressure exerted by the weight of the air above a surface.
The most basic change in pressure is the twice daily rise and fall due to the heat from the sun. Each day, the pressure is at its lowest around 4 a.m./p.m., and at its highest around 10 a.m./p.m. The magnitude of the daily cycle is greatest near the equator, decreasing toward the poles.
Atmospheric pressure is the force exerted against a surface by the weight of the air above the surface.
The 500 millibar constant pressure charts is the mainstay of the upper air charts. If meteorologists could only look at one chart, the 500 mb level chart would, by far, be the top choice. Ranging in elevation from 16,000 feet (4,980 meters) to nearly 20,000 feet (6,000 meters), this is considered the "middle" of the atmosphere.