Which factor does NOT affect air density?

Air density is influenced by several key environmental factors, including pressure, temperature, and humidity. These elements interact in specific ways to determine how much mass of air occupies a given volume.

Pressure has a direct relationship with air density; as pressure increases, air density increases as well. This is because compressing air into a smaller volume raises its mass per unit volume. Similarly, temperature also plays a significant role: warmer air is less dense because the molecules are more energetic and tend to occupy a larger volume compared to cooler air where molecules are more closely packed together.

Humidity contributes to changes in air density as well; moist air is lighter than dry air at the same temperature and pressure because water vapor has a lower molecular weight compared to the nitrogen and oxygen that make up most of the atmosphere. Therefore, an increase in humidity can decrease air density.

Wind speed, on the other hand, does not directly impact air density. While wind can affect weather conditions and pressure distributions, it is a movement or flow of air rather than a static condition. Wind speed alters how air moves and can influence factors like temperature and pressure indirectly, but it does not change the density of the air itself at a particular location at a given time. Thus, in the context of factors affecting