conversion
You don't really "convert a unit of measurement"; you convert from one unit to another. The two - "from" and "to" are always required.
You can't just convert any unit into any other unit. The units must be compatible - measure the same type of thing. For example, you can convert a unit of length to another unit of length, or a unit of time to another unit of time. An atmosphere is a measure of pressure, a foot is a measure of length, so you can't convert it.
The measure unit of a kilometer stick is kilometer.
secret
numerator; to ---apex
That means that if you have a measurement in one unit, you convert it to another unit. For example, if a measurement is given in millimeters, you may need to convert it to meters.
A litre is one, a gallon is another.
unit
You don't really "convert a unit of measurement"; you convert from one unit to another. The two - "from" and "to" are always required.
Dimensional analysis
a gram
You can't just convert any unit into any other unit. The units must be compatible - measure the same type of thing. For example, you can convert a unit of length to another unit of length, or a unit of time to another unit of time. An atmosphere is a measure of pressure, a foot is a measure of length, so you can't convert it.
No No they are not the same. BTU is a unit of measure, square foot is another unit of measure. So BTU per square foot is refining the unit of measure further. Another example of your question would be: miles and miles per gallon, two different but related units of measure.
It measures the quantity of the real GDP of other countries that you get for a unit of your countries real GDP
the ratio at which a unit of the currency of one country can be exchanged for that of Another Country. (www.dictionary.com)
That is like asking, "What is the color of white?" The unit of measure in the metric system for a liter is a liter. Which is why we call it a liter.
. . they are a convenient unit. Another convenient unit is the parsec.