All physical quantities are combinations of one or more of
the dimensions of length, mass, time, and electric charge.
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when reducing or enlarging the dimensions you obviously have to change the dimensions. but do not change the ratio of the vaules. also do not cahnge the unit of the values.
a plane
6 in by 8 in by 10 in.
In 2 dimensions, a circle. In 3-dimensions, a sphere.
The four dimensions of Space Time are one real dimension r=ct and three vector dimensions Ix + Jy + Kz. All the dimensions have units of meters. The idea of a dimension of time is an historical artifact.