The atmosphere is a mixture of gases ... That leaves approximately 1%, which is made up of atoms of unreactive argon, and molecules of carbon dioxide. Carbon dioxide is a product of respiration ...

down to Earth, highlighting unique properties of air's main ingredients: nitrogen, oxygen, argon and water. But things really get interesting as stealthy, one-in-a-billion types of chemicals are ...

SINCE most high-temperature chemical systems are sensitive to small partial pressures of oxygen in argon, which is commonly used as an inert atmosphere, it is of interest to know the oxygen ...

Sputtering to space: To better understand how Mars lost much of its atmosphere, MAVEN measured isotopes of argon gas in the upper Martian atmosphere. Argon is a noble gas, meaning it rarely reacts ...