Nitrogen.
People might hold their breath when passing gas because the same muscles used to hold in the breath are also used to control the release of gas. Holding the breath can create higher pressure in the abdominal area, making it easier to push the gas out. It's a natural reaction that can make passing gas feel more discreet or controlled.
they developed a gas mask.
in event of a gas attack, gas masks saved lives by filtering air so people could breath
This gas is oxygen from air.
Unless the particles collide
Hold your breath or use a gas mask DONT date him/her
yes oxygen is the gas that helps us breath without it we would die
Carbon dioxide
stop look listen
carbon dioxide
the gas is may be another chemical that the fish can breath at the surface an can help to make the fish can breath at small air and big water.
Oxygen