What is the standard atmospheric pressure at sea level?

Answer 1

At STP it is 1 bar

Answer 2

Atmospheric pressure at sea level is the result of the force of gravity on the matter above sea level (the atmospheric gases). The amount of matter is not constant due to the height and density of the atmosphere (mostly due to temperature and water content/humidity).

Unfortunately for the student, there are many, many different units for measuring atmospheric pressure. Standard air pressure at sea level is most easily defined as 1 atmosphere, or 1 atm.

In terms of an international (ISO) standard, it is defined to be 101325 Pa or 101.3 kPa (kilo-Pascals) at a temperature of 15 °C. In meteorology outside of the United States (and sometimes among scientists in the USA), hPa (hectoPascal) is most commonly used (=1013.25 hPa)

Note that a Pascal is also equal to N/m2 - Newtons per square meter, while 1 hpa = 1 mb (millibar) which is convenient for meteorologists, as noted above. Therefore, standard atmospheric pressure also = 1.01325 bar = 1013.25 mb.

The metric value is commonly accepted to be 760mmHg(millimeters of Mercury, also "torr"). "Millimeters of Mercury" is a measure that come from a kind of barometer (pressure meter) that uses a column of mercury in a glass tube to measure pressure: The higher the pressure, the taller the column of mercury.

In American units of measure, it's 29.92 in. Hg (inches of mercury) or 14.696 psi (pounds per square inch). This means that, at sea level, the weight of air pressing on every square inch of something is almost 15 pounds.

Something to think about: If you had 1 square inch of room-temperature mercury that was 29.92" tall, it would weigh ... 14.696 pounds!

Again, these are the average atmospheric pressures only at sea level. Pressure drops as we gain altitude; for instance, in Denver, approximately 1 mile above sea level, atmospheric pressure drops to approximately 12.2 PSI or 841.4 millibar.

If you were at sea level, the weight of the air pressing down on you would be 1.03 kilograms per square centimeter.or 1013.25 millibars.

Answer 3

'Standard' atmospheric pressure is defined at sea level as 101,325 pascals (newtons per square metre), 760 millimetres of mercury or about 1 bar (1000 millibar). These numbers are equivalent values using different measurement systems. Naturally air pressure varies with the prevailing weather conditions, but usually by no more than about 10% either above or below. 14.7 pounds per square inch. This varies quite a bit though, as the local weather changes. Also, 14.7 PSI is the atmospheric pressure at sea level this drops as we gain altitude, as a for instance, Denver approximately 1 mile above sea level has an atmospheric pressure of approximately 12.2 PSI since 986.9 millibar equals 14.7 PSI 12.2 PSI equals 819.1 millibar and as Low or high pressure cells move into any area, the atmospheric pressure will vary in kind.

Answer 4

At sea level atmospheric pressure is approximately, 14 lbs /sq in, (poumds per square inch), or, supports a column of water to about 29 inches (domestic Barometer), or 760 mm Hg ( millimetres of mercury) , or 101352 Pa (Pascals) . Atmospheric pressure varies as weather systems pass over.

Answer 5

Approximately 14.7psi, 1bar, or 1,000mbar. The mesaures, however, are not exact correlations. More accurately, ~14.7psi should equal ~1.013bar, for example. In general information though, the rounded numbers are often given with notation that they are approximate. Therefore, generally, the average sea level air pressure on Earth is approximately 1 bar. High and Low pressures that you might recall being referred to in weather reports are being compared relatively to this approximate standard. It would therefore be generally appropriate to say that 1,000mbar of pressure is normal, 1,075mbar would be high pressure, and 950mbar would be low pressure, like would be found in a hurricane.

Answer 6

Atmospheric pressure has a unit of its own, "Atmospheres", 1 Atmosphere is equivalent to 1.01325 Bar.

Atmospheric pressure does change according to the weather (as a result of temperature on air pressure) and your altitude, the environment of the earth is incredibly varied, ranging from 50+ degrees Celsius deserts where it has NEVER rained, to below -80 degrees Celsius, colder than liquid Radon, in the poles and certain parts of Siberia. So it would be ignorant to take the average and consider that representative of the entire earth.

Anyways... heres what you wanted: "Average sea-level pressure is 101.325 kPa (1013.25 mbar, or hPa) or 29.921 inches of mercury (inHg) or 760 millimeters (mmHg)."

Answer 7

The standard atmospheric pressure at sea level is approximately 101.3 kilopascals, or 1 atmosphere (atm).

Answer 8

The standard atmospheric pressure at sea level is 1013 millibars.

Answer 9

1 atmosphere, 760 Torr and 101,325 Pascals.

Answer 10

1.7 dol \if you got wvaed a