The Casimir effect demonstrates that empty space is not truly nothing, as two neutral metal plates placed extremely close together in a vacuum experience a tiny measurable attractive force due to the difference in quantum wave modes between the gap (where only certain standing waves fit) and the outside (where modes are less restricted).
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Empty Space Can Push ThingsAdded:
One of the cleanest examples is the Casimir effect. Place two neutral metal plates into this vacuum extremely close together. Inside the gap, only certain standing waves fit. Outside, the modes are less restricted. That difference shows up as a tiny attractive force.
Tiny, but measurable. So, empty space cannot be absolute nothing.
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