an unknown quantity represented by a letter
That's basically what rate means - a comparison of two proportional quantities.
'Feet' and 'square feet' are completely different units, used to measure completely different quantities, and neither of them can be converted to the other.
Muscular endurance
This is not a valid comparison; milligrams (mg) is a measure of weight or mass while milliliters (mL or ml) measure volume.
None. A litre is a measure of volume, with dimensions [L3]. A kilometre is a measure of distance, with dimensions [L]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
The ratio between two different quantities is the rate.Usually, the second unit is a measure of time.
measure
The ratio between two quantities, usually quantities that somehow measure power, or intensity (power / area).
First the units of the two quantities should have the same category, e.g length units, or mass units, etc. Second: to convert the unit of one quantity to the same unit of the another quantity. third: to perform the comparison.
There is NO comparison as feet measure length and ounces measure weight.
Milliliters and milligrams measure different quantities (volume and mass, respectively) Unless you are given a density, you can't convert between them.
A kilonewton is a measure of force whereas a ton is a measure of mass. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other (or comparison between them) is not valid.
how primitive people measure quantities
The name of the calculator that helps to measure the speed of an aeroplane in knots is called a conversion calculator. This allows for an equal comparison between different measurement types.
There can be no comparison. A centimetre is a measure of length or distance in 1-dimensional space while a gallon is a measure of volume in 3-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, comparison between the two is not valid.
That's basically what rate means - a comparison of two proportional quantities.
There is no comparison: they are different in almost every way. 10 bar is a measure of pressure while a kilogram is a measure of mass. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information. A bar is an Imperial measure whereas a kilogram is an SI measure.