cuz the united states is a pig headed 'democratic' state which thinks it is always right even though it is mostly wrong.
Centi (= 10-2) is an accepted prefix in the International System of Units (SI).
The three systems of units in physics are the International System of Units (SI), the British Imperial System, and the US Customary System. The SI system is the most widely used and accepted system in the scientific community, while the British Imperial and US Customary systems are primarily used in the United Kingdom and the United States, respectively.
To comply with the internationally accepted SI units.
Force is measured in units of newtons (N) in the International System of Units (SI) or pounds (lb) in the US customary system.
Système International, the international system of units since 1960.Includes everyday measurements like grams, litres and metres. Widely used as the established system of measurement throughout the world with the notable exception of the US.
It's used for all measurement in most of the world. This is also called the metric system; SI is the French abbreviation for System International - and it's used internationally. The US is the most obvious country that doesn't use metric units for everyday measure, although these units are used in science and medicine among others.
The answer here us weight. The gram is the International system of units (SI) designated unit for weight.
The SI system, The International System of Units, from the French Système international d'unitésIn 1960, the metre-kilogram-second system was revised to form the SI system. The SI system is built on seven basic units;metre-lengthkilogram-masssecond-timeampere-electric currentkelvin-temperaturecandela-luminous intensitymole-amount of substance.All other units of measure, including British Imperial and US customary, are now either derived from, of defined in terms of these seven units.
The international system of units is practically legal in all the countries; but some countries as United States, United Kingdom and the old colonies of US and UK refuse this system.
Perhaps the best way is to describe it is "inconsistently". Most scientists use the international system and when they don't, they have disasters like the one that trashed NASA's Mars Climate Orbiter!
US system, or imperial system.
In the United States we use US, or Customary Units, like inches, feet, etc. In most other countries they use the international system, or SI, units, like meters, kilometers, etc. In the SI system conversions are made in multiples of 10, making it simpler