---
title: Kilogram, ampere, kelvin and mole redefined
description: An international team of scientists with representatives from 60 countries has agreed on new definitions of the kilogram, ampere, kelvin, and mole. The new definitions hinge upon the laws of physics rather than physical artifacts and will be implemented on May 20, 2019.
---

[Fluid Systems Engineering & Management Blog | Swagelok NorCal ](https://northerncal.swagelok.com/blog)

# [Kilogram, ampere, kelvin and mole redefined](https://northerncal.swagelok.com/blog/kilogram-ampere-kelvin-and-mole-redefined)

 Written by [Jeff Hopkins](https://northerncal.swagelok.com/blog/author/jeff-hopkins) | 1/3/19 5:00 PM

An international team of scientists with representatives from 60 countries has agreed on new definitions of the kilogram, ampere, kelvin, and mole. **The new definitions hinge upon the laws of physics rather than physical artifacts**, and will be implemented on May 20, 2019.

[Read the full article on Science Daily→](https://www.sciencedaily.com/releases/2018/11/181116115556.htm)

[View full post](https://northerncal.swagelok.com/blog/kilogram-ampere-kelvin-and-mole-redefined)

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