Dry air contains roughly (by volume): All the above are relatively small, light, non-polar molecules, characteristics mimicking an ideal gas. At normal ambient conditions such as standard temperature and pressure, most real gases behave qualitatively like an ideal gas.
provide - take measures in preparation for; provide for the proper care of the passengers on the cruise ship gear up, prepare, ready, set, fix, set up - make ready or suitable or equip in advance for a particular purpose or for some use, event, etc; Get the children ready for school!; prepare for war; I was fixing to leave town after I paid the hotel bill
source. n. 1. A person or thing from which something comes into being or is derived or obtained: alternative sources of energy; the source of funding for the project.2. The point of origin of a stream or river.. a person, group, etc, that creates, issues, or originates something: the source of a complaint. 4. a. any person, book, organization, etc, from which information, evidence, etc, is obtained. b. (as modifier): source material.