Udara adalah gas pernapasan yang paling umum, dan satu-satunya alami–namun sejumlah gas murni atau campuran gas digunakan dalam peralatan pernapasan dan habitat tertutup seperti perlengkapan scuba, perlengkapan penyelaman dibekali dari permukaan, ruang menyelam, kapal selam, pakaian luar angkasa, wahana antariksa, dukungan kehidupan medis dan perlengkapan pertolongan pertama, panjat gunung altitudo tinggi, dan mesin anestetik.
Where the issue of export licences would or might result in the available budgetary amounts being exceeded or in the maximum quantities which may be exported with a refund being exhausted during the period concerned, in view of the limits referred to in Article # of Regulation (EC) No #/#, or would not allow exports to continue during the remainder of the period, the Commission mayWikiMatrix WikiMatrix