If I say Height of a block = 2m, then would "Height" be called as a dimension


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

  • $\begingroup$ I don't really like this answer because there's no reason there have to be only three dimensions. $\endgroup$
    – David Z
    Jul 15 '15 at 12:47
  • $\begingroup$ Agreed. 7 fundamental dimensions. Principle is correct however. $\endgroup$
    – Phizzy
    Jul 15 '15 at 13:13
  • $\begingroup$ Would it be correct to say that a dimension is a degree of freedom - a quantity or a quality by which a system can vary? $\endgroup$
    – Ernie
    Jul 15 '15 at 13:27
  • $\begingroup$ I was starting simple here. $\endgroup$ Jul 15 '15 at 17:12

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