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The atmosphere is primarily composed of Nitrogen (N2), which accounts for 78%. Oxygen follows, accounting for 20% of its volume, with argon less than 1%. The remainder is composed of particulates and trace gases, including water vapor.

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The air you breathe in is 78 of what gas as is 79 of the air you breathee out?

Nitrogen


What is the second most common gas found in the air we breathe?

Oxygen is the second most common/abundant gas in the air that we breathe. Nitrogen is the most abundant gas in the air we breathe. The composition of air is often treated as 79 mole or volume percent N2 and 21 mole or volume percent O2.


What gas is not hazardous to breathe in low concentration?

Every day, you breathe nitrogen and oxygen along with many other gases. Helium is inert and poses no threat at all except if you breathe only helium and you deprive yourself of oxygen. In theory, any gas can be breathed in small concentrations since the concentration is what determines hazardous effects. Even Oxygen can kill you if it is in too high of a concentration.


The concentration of ozone is highest where it exits the devise and generally decreases as one moves further away?

Yes, that's correct. Ozone concentration is typically highest at the point of release from the device, and it decreases as it disperses into the surrounding environment. This is because ozone is a reactive gas that can react with other substances in the air, reducing its concentration over distance.


What is upper explosive limit?

The upper explosive limit (UEL) is the maximum concentration of a gas or vapor in air above which it cannot ignite or explode. This means that if the concentration of the gas exceeds the UEL, there is not enough oxygen present for combustion to occur. It is important to stay below the UEL when working with flammable substances to prevent explosions.