ATMOSPHERE CAN INCLUDE MEANINGS RELATED TO GASEOUS LAYER
AND IT CAN BE CONSISTED OF 1 GAS OR MIXTURE OF MORE GASES.
EARTH ATMOSPHERE IS MIXTURE OF 3/4 NITROGEN, 1/4 OXYGEN
AND SMALL AMOUNTS OF CARBON DIOXIDE AND SOME MORE GASES
BUT IN ARTIFICIAL CONDITIONS, ATMOSPHERE CAN BE CREATED FOR SPECIFIC PURPOSE, FOR EXAMPLE IN CHEMICAL LAB EXPERIMENTS
THEY USE ATMOSPHERE OF ONLY NITROGEN IF THEY WANT TO PROTECT SOMETHING SENSITIVE WHICH CAN REACT WITH OXYGEN
AND WE CALL IT "NITROGEN ATMOSPHERE"
THAT IS EXAMPLE IN MY JOB WHERE I WORK,
WE HAVE ONE TRANSPARENT BOX WITH ANALYTICAL BALANCE
AND INLET OF NITROGEN, WE LET NITROGEN GAS COME IN AND EXPEL OXYGEN COMPLETELY, SO WE CAN OPEN PACKAGE OF ONE SENSITIVE CHEMICAL, AND SOME VITAMINS ALSO.