21. The �ngstr�m is internationally recognized, but is not a formal part of the International System of Units ( SI ). 22. The International System of Units ( SI ) specifies a set of seven powers of one or more of the base units. 23. The International System of Units usually only permits the use of a capital letter when a unit is named after a person. 24. Under this system, which would become the International System of Units ( SI ), the ohm is a derived unit. 25. In the International System of Units ( SI ), the unit of energy is the joule, named after James Prescott Joule. 26. In the International System of Units ( SI ), the unit is the newtons per square metre ( N / m?). 27. The system was developed because of the difficulties in measuring and expressing astronomical data in International System of Units ( SI units ). 28. This usage is also not part of the International System of Units and when used this way it is redundant with the mole. 29. Now there is a global standard, the International System of Units ( SI ), the modern form of the metric system. 30. The International System of Units has been developed countries; however, the adoption has not been universal in all English-speaking countries.
