What Makes The Wind Blow? (1965)

What Makes the Wind Blow explains the fundamental forces behind wind and air movement using real-world and laboratory demonstrations. The film shows that wind is caused by differences in air pressure, which result from unequal heating of land and water by the sun. Since land heats up faster than water, warmer, lighter air over land rises, and cooler, heavier air from over water moves in to replace it—creating wind. Experiments illustrate how heated air expands, becomes less dense, and rises, while cooler air sinks. The film also demonstrates how large-scale weather patterns, like cold air masses from inland regions, can override local conditions and shift wind direction dramatically. These processes connect local breezes to global air circulation, driven entirely by solar energy and the Earth’s rotation, making wind a constant and essential part of Earth’s climate system.

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