Source of Cave's Name
Caves are said to "breathe," that is, air continually moves into or out of a cave, equalizing the atmospheric pressure of the cave and the outside air. When the air pressure is higher outside the cave than in it, air flows into the cave, raising cave's pressure to match the outside pressure. When the air pressure inside the cave is higher than outside it, air flows out of it, lowering the air pressure within the cave. A large cave (such as Wind Cave) with only a few small openings will "breathe" more obviously than a small cave with many large openings.
Rapid weather changes, accompanied by rapid barometric changes, are a feature of Western South Dakota weather. If a fast-moving storm was approaching on the day the Bingham brothers found the cave, the atmospheric pressure would have been dropping fast, causing the cave's higher-pressure air to rush out all available openings, creating the "wind" for which Wind Cave was named.
Read more about this topic: Wind Cave National Park
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