Certified Transport Registered Nurse Certification Practice Exam

What happens to gas molecules as they move closer to sea level?

1. They become less reactive

2. They move slower

3. They increase in number and move faster

4. They gain mass

The correct answer is: They increase in number and move faster

As gas molecules move closer to sea level, the atmospheric pressure increases, which affects their behavior. With the increase in pressure, gas molecules become more densely packed. This increase in density leads to a greater number of gas molecules in a given volume. Additionally, according to the principles of gas dynamics, as pressure rises at constant temperature, the molecules occupy a smaller volume, which can result in increased kinetic energy and faster movement. This combination of increased density and kinetic energy means that the molecules increase in number within the space and also move faster due to both the greater frequency of collisions among them and the influence of the warmer temperatures typical at lower altitudes. The increases in molecular speed and number contribute to the understanding of gas laws in relation to altitude changes, showcasing the interactions among temperature, pressure, and volume in gaseous substances.