It is ratio.
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different between variable intervals and fixed ratio
spatial
it matters in lots of cases. by definition speed or velocity is the ratio of distance traveled to time taken. In equation form v = d/t distance must be first. density is the ratio of mass to volume density = mass/volume mass is first
The retention factor of a particular material is the ratio of the distance the spot moved above the origin to the distance the solvent front moved above the origin.
If the first derivative of a function is greater than 0 on an interval, then the function is increasing on that interval. If the first derivative of a function is less than 0 on an interval, then the function is decreasing on that interval. If the second derivative of a function is greater than 0 on an interval, then the function is concave up on that interval. If the second derivative of a function is less than 0 on an interval, then the function is concave down on that interval.