Final answer:
The line graph shows that air density decreases with increasing altitude, with significant decline at the altitude of Mount Everest, impacting mountain climbers who require oxygen tanks due to the 'thin air'.
Step-by-step explanation:
Understanding the Altitude-Air Density Relationship
The information provided indicates that the data concerning the density of gas particles at different levels of the atmosphere can be represented through a line graph, showing a relationship between altitude and air density. A line graph, specifically Figure A4, visualizes how air density decreases as altitude increases. The graph highlights that at ground level, air is denser, with the air density gradually lessening as one ascends, necessitating the use of oxygen tanks by mountain climbers at high altitudes like the peak of Mount Everest.
For example, at an altitude of 500 meters, the air's density is about one kilogram per cubic meter. However, at the altitude of Mount Everest, approximately 8,828 meters, the air density falls to a mere 0.023 kilograms per cubic meter. This decrease in air density at higher altitudes contributes to the 'thin air' experienced and is crucial for understanding environmental and physiological effects of high altitude on humans and equipment.