Mask breathing: Listen & Download Mask breathing .mp3 Error! Change your browser, please! ⇓ Download Steam ⚠ Helium balloon ⚠ Air is blown through a glass tube ⚠ Mask breathing ⚠ Balloon inflating ⚠ Oxygen balloon ⚠ Air pressure ⚠ Inflating a mattress ⚠ Air is let through the regulator ⚠ Suction action of air ⚠ Rope torsion ⚠ The work of oxygen equipment, the release of ⚠ ★★★★★