Airline Transport Pilot Written Knowledge Practice Test

The primary effect of pressure differences in the atmosphere is that it generates wind. When there is a difference in atmospheric pressure between two areas, air will move from the area of higher pressure to the area of lower pressure in an attempt to equalize the pressure. This movement of air is what we experience as wind. The greater the pressure difference, the stronger the resulting wind will be. Temperature changes, precipitation, and humidity levels can all be influenced by wind, but they are not direct effects of pressure differences. For example, while winds can transport moisture and lead to precipitation, the act of rain falling is not a direct consequence of pressure differences but rather a result of complex interactions involving humidity and temperature. Therefore, wind is the most immediate and direct result of atmospheric pressure variations.