Why do crisp packets become inflated at high altitudes? Again, explain in as great a detail as possible, using ideas about particles and air pressure to help justify your response.
As you get higher the atmospheric pressure lowers. The pressure in the packet of crisps has the pressure at which it has been closed (pressure at the surface of the earth). This means that the air molecules in the packet press harder outside than the air molecules in the atmosphere press on the packet.
