The ratio of one quantity to an other is a fraction - and the number of times one quantity is contained in another quantity of the same kind.
The ratio between two quantities is the quotient obtained by dividing the first quantity by the second.
Example - Ratio
The ratio between 3 and 6 can be expressed as
3 / 6 = 1 / 2 = 0.5
Ratio can also be indicated by the sign ":" - like 3 : 6 or 1 : 2 .
Reciprocal or Inverse Ratio
The reciprocal or inverse ratio is the opposite of the original ratio.
Example the Inverse Ratio
The inverse ratio between 6 and 3 can be expressed as
6 : 3 = 2 : 1 = 2
Proportion is the equality of ratios.
Example - Proportion
1 : 2 = 3 : 6
1 : 2 :: 3 : 6
The SI-system, unit converters, physical constants, drawing scales and more.
Mathematical rules and laws - numbers, areas, volumes, exponents, trigonometric functions and more.
Energy balance and energy payback ratio.
Law of fractions
Machines and movement ratio (velocity ratio).
Working with relative values.
When a material is stretched in one direction it tends to get thinner in the other two directions.
Some metals and their Poisson's Ratios.