Which three factors affect air density?

The chosen answer accurately identifies three critical factors that impact air density: temperature, altitude, and humidity.

Temperature plays a significant role in air density because warmer air is less dense than cooler air. As the temperature rises, the air molecules gain energy and spread apart, leading to a decrease in density. Conversely, cooler air has more closely packed molecules, resulting in higher density.

Altitude refers to the height above sea level, which greatly influences air density. As altitude increases, the atmospheric pressure decreases, and there are fewer air molecules present. This decline in pressure leads to a decrease in the density of the air. In higher altitudes, the air is thinner, meaning it is less dense than it would be at lower elevations.

Humidity, which refers to the amount of water vapor in the air, also affects air density. When humidity increases, water vapor molecules, which are lighter than the nitrogen and oxygen molecules that constitute most of the air, displace some of those heavier molecules. This results in a decrease in density; wetter air is less dense than drier air at the same temperature and pressure.

The other options include factors that may influence atmospheric conditions, but they do not correctly identify the core elements that dictate air density. For example, while wind