The barometric pressure expressed in hPa. You can usually find them on your local weather stations website. To find the air density at any given location, you will need some basic weather parameters. As a rule of thumb, you can expect a drop of 0.0022-0.0023 lb/cu ft (0.035-0.036 kg/m³) per 1000 ft of altitude change. If you change the air temperature, humidity, or the altitude (and hence the pressure), the air density will change, too. One exceptions is water vapor the more water vapor in the air, the lower its density.įor dry air, its density at sea level at 59 ☏ (15 ☌) and 14.7 psi (1013.25 hPa) (mean sea-level pressure), is approximately 0.0765 lb/cu ft (1.225 kg/m³). Most components have similar densities and don't influence the overall density in a substantial way. However, the air will cease to be dry air when water vapor appears.Īs a mixture of gases, air doesn't have a constant density this value depends largely on air composition. The remaining 1 % contains many different gases, among others, argon, carbon dioxide, neon or helium. Dry air mostly consists of nitrogen ( ~78 %) and oxygen ( ~21 %). The density of air is usually denoted by the Greek letter rho, or ρ, and it measures the mass of air per unit volume (e.g. You might also want to check out our speed of sound calculator which is a tool that helps you calculate the speed of sound in dry air and water at any temperature. In the following text, you will find out what is the air density at sea level and the standard air density. Therefore, air pressure decreases with increasing altitude. It is easy to imagine that the higher you stand, the less air is above you and the pressure is lower (check out our definition of pressure!). The air pressure can be related to the weight of the air over a given location. It mainly changes with temperature, relative humidity, pressure and hence with altitude (take a look on the air density table below). The density of air depends on many factors and can vary in different places. Continue reading to get a better understanding of the relationship between the local weather and ρ, and learn what air density levels you can expect in various regions. This value is vital for many further calculations, such as determining the aerodynamic drag forces or the performance of wind turbines. The Snowfall to Meltwater Conversion Table is a guide for estimating the water equivalency of newly fallen snow for various temperature ranges.Use this air density calculator to instantly find how tightly packed an object's molecules are, allowing you to estimate ρ (air density) basing on the local temperature and pressure conditions. The Marine Beaufort Scale is a system for estimating wind speed based on observed conditions at sea. The Land Beaufort Scale is a system for estimating wind speed based on observed conditions on land. NOAA's National Weather Service Meteorological Calculator provides calculations and conversions for temperatures, wind chill, relative humidity, wind speed, or heat index. To understand and interpret the data, please reference the below tools. Weather and climate data are presented in various meteorological units. Launch Toolkit Calculators and Conversion Tables The Toolkit displays custom data overlays, Web Map Services (WMS), animations, and basic filters. The Weather and Climate Toolkit provides simple visualization and data export of the weather and climate data archived at NCEI.
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