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Atmospheric pressure, also known as air pressure or barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa ), which is equivalent to 1,013.25 millibars , [ 1 ] 760 mm Hg , 29.9212 inches Hg , or 14.696 psi . [ 2 ]
Atmospheric pressure is the total weight of the air above unit area at the point where the pressure is measured. Thus air pressure varies with location and weather . If the entire mass of the atmosphere had a uniform density equal to sea-level density (about 1.2 kg/m 3 ) from sea level upwards, it would terminate abruptly at an altitude of 8.50 ...
Pressure as a function of the height above the sea level. There are two equations for computing pressure as a function of height. The first equation is applicable to the atmospheric layers in which the temperature is assumed to vary with altitude at a non null lapse rate of : = [,, ()] ′, The second equation is applicable to the atmospheric layers in which the temperature is assumed not to ...
Loudness is the subjective experience of sound pressure and is measured as a sound pressure level (SPL) on a logarithmic scale of the sound pressure relative to some reference pressure. For sound in air, a pressure of 20 μPa is considered to be at the threshold of hearing for humans and is a common reference pressure, so that its SPL is zero.
Its launch is likely an attempt to challenge newer, shinier Answer rivals like Quora. It's also the latest in the list of mobile apps Yahoo released this year. Yahoo Answers Now is a standalone ...
what is the difference between air density and air pressure? air pressure is a result of air density Please sign your messages with ~~~~. Air density is the (local) mass per unit volume (kg/m3). Air pressure is the force per unit area exerted by the weight of the total column (just about) and is thus N/m2.
Say "goodbye" to one of the internet's favorite dinosaurs. Yahoo announced today that its' social Q&A platform, Yahoo Answers, will shut down on May 4. In addition to the shut down, users will no ...
Save a physical copy of important emails you've sent or received. Check out how to print emails and attachments in AOL Mail. 1. Open the email you'd like to print. 2. Click the Print icon. - A window will appear with your message. 2. Click the Print icon again. 3. Follow the browser prompts to finish printing.