Articles — Measurement Science & Standards

Original articles summarising and citing NIST and BIPM primary sources on SI units and international metrology standards.

How the Kilogram Was Redefined in 2019 — NIST
How the Metre Is Defined by the Speed of Light — BIPM
The Seven SI Base Units Explained — BIPM
ITS-90: The International Temperature Scale Explained — BIPM
What Is a Leap Second and Why Does It Exist? — NIST
How Atomic Clocks Work and Why They Matter — NIST
Why the United States Never Fully Adopted the Metric System — NIST
The Pascal: From Torricelli's Barometer to the SI Standard — NIST
The Second: How Atomic Timekeeping Defines Our Unit of Time — NIST
The Mole and Avogadro's Number: Chemistry's Counting Unit — BIPM
The Metre Convention: 150 Years of Global Measurement Cooperation — BIPM
How GPS Relies on Atomic Clocks and Measurement Standards — NIST
Food Labelling and the Science of Nutrition Measurement — NIST
The Gallon: Why the US and UK Use Different Sized Gallons — NIST
The Candela: Measuring Light the Way the Human Eye Sees It — BIPM
The History of the Thermometer: From Galileo to the Boltzmann Constant — NIST