is defined a Force per unit area. With gases the force
comes from the gas molecules hitting the side of the
container. Air pressure is measured with a barometer.
Gas pressure is a gauge of the number and force of
collisions between gas particles and the walls of the
container that holds them. The SI unit for pressure is
the pascal (Pa), but other pressure terms include
atmospheres (atms), millimeters of mercury (mmHg), and
torr. The following is a list of all of the standard
pressure in every unit for pressure.
is defined as the force per unit area exerted against a
surface by the weight of the air above that surface. The Diagram below ,
the pressure at point "X" increases as the weight of the air above it
increases. The same can be said about decreasing pressure.
In the mountains there is less
air above you so less pressure. Since gases are
compressible, this creates an environment in the
mountains that has less air per unit volume. It will be
harder to breathe in the mountains because there is
actually less O2 per volume compared to at
Pressure Conversion Examples-Highlight to