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Originally Posted by Gem
What's a 'physical dimension'?
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As opposed to a non physical dimension. We have modelled dozens of dimensions that theoretically exist but none of them have any qualities we can measure here, in physical reality. A physical dimension can be measured just like any other physical dimension can. The one I am positing is folded out in our dimension at least as much as the other recognised 3, so it can be viewed, measured and is predictable.
Sometimes time is referred to as a separate dimension but I don't personally see time as a physical dimension. Maybe spacetime, but not time. It's all just models anyway. We make it real in our minds.