Three nations have not officially adopted the International System of Units as their primary or sole system of measurement: Burma, Liberia, and the United States.
"Please give your answer in SI units"
Because it was developed in Europe for international use from the French "Systeme International" (SI)
I need help
Use a conversion factor
They are used in MOST countries of the World. It seems that only three countries don't use the metric system (SI) yet. That being said, in the non-scientific communities, as well as in certain sciences, certain non-SI units are used - for example, Celsius or Centigrade for temperature (instead of Kelvin); time measured in minutes, hours, days and years (instead of seconds); or energy being measured in kWh (instead of Ws = Joule).
SI units, which is the abbreviation for International System of Units, is used for making measurements that can be understood in various countries. While most countries have no adopted SI units as their form of measurements, some countries like the United States only use them in certain areas of study.
That means that if two different scientists use SI units, they will use the SAME definition of the units, even if they live in different countries. In contrast, if they use "pounds" for example, this isn't the case, since different countries may use different definitions of pounds.
Liberia, Myanmar, and the United States
SI units are the common unit of almost the whole world. Those countries that haven't yet joined the modern world have to use SI if they want to be taken seriously as scientists.You have to have a common language in scientific measurement, that common language is the SI system.
What units can si is in widespread use and is acceptable for use with si
most of the world does SI so more people can understand with it in SI units
most of the world does SI so more people can understand with it in SI units
"Please give your answer in SI units"
Of all countries in the world that has an officially established system of measurement, only Burma/Myanmar, Liberia and the United States do not use the International System of Units (SI). The United States use Imperial units and U.S customary units. That is not to say that SI is not in use in the U.S. The customary units are nowadays defined from SI units. And the National Institute of Standards and Technology uses it. To answer your question: the metrication of the United States is gradual and there is no fixed date where you can say that the US adopted SI. http://en.wikipedia.org/wiki/Metrication_in_the_United_States
Systeme Internationale (SI)
In SI units, use centimeters or meters. In non-SI units, use inches or feet.
Because it was developed in Europe for international use from the French "Systeme International" (SI)