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But just because we cannot measure the length of something exactly doesn't mean that it doesn't have an absolute length.
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But without being able to measure it, how can we know that it's length is absolute? On a more practical scale, we can never measure the absolute surface area of a concrete slab because variations in temperate cause the concrete to subsequently expand and contract. Therefore, we know that the surface area of a concrete slab is relative to the current temperature, which in turn is relative to many other factors. Apply this to the chair and you will see that the chair doesn't have an absolute height.