What is the movement of air from high pressure areas low-pressure areas

Wind

Explanation:

Wind refers to a mass of moving air. Air has pressure. Air always moves from the region of higher pressure to that of lower pressure. The intensity of the pressure gradient determines the speed of the air movement. A higher pressure gradient imparts higher speed to the air movement. Hence,  movement of air from high pressure areas low-pressure areas is called wind.

b. read the phase at the intersection of any given temperature and pressure.