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The helium that lifts balloons is a ‘leaky’ gas for the planet. Being so light, it rises high, and some atoms gain enough speed to escape into space—Earth slowly loses it.
A balloon rising is a clue: helium loves going up. Over long timescales, that becomes a real escape story in the highest layers of the atmosphere.\n\nHelium is extremely light, so it drifts upward more easily. In the upper atmosphere, particles can move faster; some helium atoms gain enough speed to overcome gravity and leak into space.\n\nSurprising detail: Earth isn’t helpless—new helium is created underground via radioactive decay. But there’s a balance between creation and escape, and the resource isn’t limitless.\n\nThis matters because helium is critical for fields from medical imaging to scientific cooling. A simple party balloon can be a tiny scene in a much larger physics-of-scarcity story.
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