grams
Kelvin
Most commonly reffered to would be RPM - Rounds Per Minute. The speed of which it is rotating.
The "L" is in the metric system for liter, which is most commonly used with liquids.
contrast ratio
It's called the Metric System.
the metric system
Among units of measurement for angles, the degree and the radian are the most commonly used, by far.
The "centimeter" is the most commonly used.
When you estimate something the word that is commonly used the most is "about". This word is saying that it is not an exact measurement.
Polarimetry is the measurement and interpretation of transverse waves. The most common polarimetry waves are electromagnetic waves (e.g. radio or light waves).
Tornadoes are most commonly found along cold front, where a cool air mass runs into a warm one.
The system of measurement commonly used in most of the world is the SI or Metric system. Aside from that one, there are various others that are used in small areas by relatively few people. One of those is the "English" system, used in Burma, Liberia, and the USA.