What percentage of air is composed of Argon at sea level?

The correct answer is based on the understanding of the composition of Earth's atmosphere at sea level. Argon is a noble gas that constitutes a small but significant portion of the air we breathe. At sea level, the concentration of Argon is approximately 0.93% to 0.94% of the atmosphere. This percentage is notably stable and has been consistent through various measurements over time.

The other percentages reflect the composition of different gases in the atmosphere. For instance, the gases at sea level primarily consist of nitrogen, oxygen, and small amounts of carbon dioxide, water vapor, and other trace gases. The value of 1.5% is higher and does not accurately represent Argon’s contribution, while 0.03% significantly underestimates it. Lastly, 0.78% is also less accurate given the established data regarding the presence of Argon in the atmosphere. Thus, recognizing that Argon represents around 0.94% allows for a clear understanding of its role in the air mix at sea level.