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There is friction, but comparatively little unless the glass is very clean. Because the glass is not touching over the majority of its surface. Instead trapped air is between the two plates. This massively reduces the coefficient of effective friction. Normally, if glass is clean so that the surfaces can touch, they will "stick together" as they are so flat and friction is so high - ask anyone working with glazing glass - they try never to let two panes touch except at an edge.

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