In the atmosphere, this gas mixture is
made up of the following gases and
proportions:
78% Nitrogen
21% Oxygen
1% Other gases
(e.g. carbon dioxide and
argon)
To attain a state of vacuum, a space
must be empty, i.e. devoid of all
gaseous material.
The consequence of this is that the
pressure in this space is very low, as it
contains no or only a small number of
particles, which exert a force on an
area as a result of their impact
against the walls.