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Casually I would say the dimensions are MASS, LENGTH and TIME (and others). A unit is a metric (yardstick) to measure said dimensions. So one meter (unit) is used to quantify a specific length (dimension). This allows the combination of dimensions through multiplication and division to derive other units such as Speed = Meter/Second => LENGTH/TIME


I think, the physical signifcance of the Planck force comes fromthe formula: looks like it's the force needed to accelerate the Planck mass to the speed of light in the Planck time right?

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