# An Introduction to the New SI

```@article{Knotts2015AnIT,
title={An Introduction to the New SI},
author={S M Knotts and Peter J. Mohr and William D. Phillips},
journal={The Physics Teacher},
year={2015},
volume={55},
pages={16-21}
}```
• Published 11 March 2015
• Education, Physics
• The Physics Teacher
Plans are under way to redefine the International System of Units (SI) around 2018. The new SI specifies the values of certain physical constants to define units. This article explains the new SI in order to provide a resource for high school teachers as well as for advanced students already familiar with the pre-2018 SI.
7 Citations
Though this draft is advanced with respect to the CCU 2013 Draft, it is shown how the description of the complex structure of the new definition may still be difficult to be clearly caught even by informed readers, while most users might be lost about their tasks needed to implement the new definitions.
• Education
• 2017
The United States is one of only three countries in the world that remain uncommitted to the metric system. Perhaps to policymakers the decision to hang on to miles, pounds, and gallons is one of
The revised International System of Units (SI), expected to be approved late in 2018, has implications for physics pedagogy. The ampere definition, which dates from 1948, will be replaced by a
• R. Ali
• Physics
Trans. Inst. Meas. Control
• 2022
The developments of primary standards for electrical quantities that practically realize the electrical units such as ampere (A), volt (V), ohm (Ω), and farad (F) are introduced in this manuscript.
This work describes a simple experiment to measure the resistor temperature as a function of the applied power and proves that it is an efficient way to introduce some important physical concepts in
• Physics
• 2017
We suggest an unified presentation to teach fundamental constants to graduate students, by introducing four lower limits to observed phenomena. The reduced Planck constant ℏ is the lowest classically

## References

SHOWING 1-10 OF 16 REFERENCES

• Physics
• 2014
In 2011, the General Conference on Weights and Measures (CGPM) confirmed its intention to adopt new definitions for four of the base units of the SI based on fixed numerical values of selected
• Education, Physics
• 2011
Since much of SI is based on physics and mathematics, physics teachers have the background to teach SI. We present this review and summary in a series of SI notes in order to help teachers answer
Possible changes to the International System of Units (SI) are being discussed, including a proposal to define the units by specifying the values of a set of fundamental constants. This note is an
• Education, Physics
• 2014
The design, construction, and performance of the LEGO watt balance and its ability to determine h, the Planck constant, are presented.
• Education, Physics
• 2010
This Resource Letter provides a guide to the literature on the physics of fundamental constants and their values as determined within the International System of Units (SI). Journal articles, books,
• Chemistry
• 2001
A review is given of the latest Committee on Data for Science and Technology (CODATA) adjustment of the values of the fundamental constants, referred to as the 1998 values, which replaces the values recommended for international use by CODATA in 1986.
The universally accepted method of expressing physical measurements for world commerce, industry, and science is about to get a facelift, thanks to our improved knowledge of fundamental constants.
• Physics, Education
• 2013
A watt balance is an electromechanical device that allows a mass to be determined in terms of measurable electrical and mechanical quantities, themselves traceable to the fundamental constants of
• Physics
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
• 2011
The objective of the proposed changes is to adopt definitions referenced to constants of nature, taken in the widest sense, so that the definitions may be based on what are believed to be true invariants.