Answer:
True
Reason: We know that standard atmospheric pressure is 14.7 pounds per square inch. We also know that air pressure
decreases as we rise in the atmosphere.
1013.25 mb = 101.325 kPa = 29.92 inches Hg = 14.7 pounds per in2
= 760 mm of Hg = 34 feet of water
Air pressure can simply be measured with a barometer by measuring how the level of a liquid changes due to
different weather conditions. In order that we don't have columns of liquid many feet tall, it is best to use a
column of mercury, a dense liquid.
The aneroid barometer measures air pressure without the use of liquid by using a partially evacuated
chamber. This bellows-like chamber responds to air pressure so it can be used to measure atmospheric
pressure.
Air pressure records:
1084 mb in Siberia (1968)
870 mb in a Pacific Typhoon
An Ideal Gas behaves in such a way that the relationship between pressure (P), temperature (T), and volume
(V) are well characterized. The equation that relates the three variables, the Ideal Gas Law, is PV = nRT
with n being the number of moles of gas, and R being a constant. If we keep the mass of the gas constant,
then we can simplify the equation to (PV)/T = constant. That means that:
For a constant P, T increases, V increases.
For a constant V, T increases, P increases.
For a constant T, P increases, V decreases.
Since air is a gas, it responds to changes in temperature, elevation, and latitude (owing to a non-spherical
Earth).
Air pressure decreases naturally as we rise in the atmosphere, or up a mountain, we must make correction to
the air pressure owing to elevation above sea level. These corrections are easily made by adding the the air
pressure that would be exerted by the air column at that elevation. For example, in the figure below, at sea
level no correction is needed. At 1000 m elevation, a correction of 99 mb is required so that the adjusted sea
level pressure of station B is 1014 mb. For an elevation of 1800 m, a correction of 180 mb is needed. So, for
a temperature of 20°C, the elevation correction is approximately equal to 0.1 x elevation. Note, this
correction is good only for approximatel
