National Physical Laboratory

Mass & Force Mass & Force

Measurements of mass, force, pressure, and density are some of the most commonly made in the UK. NPL ensures that these measurements can be made traceable to internationally agreed standards. 

Measurements of the mechanical quantities of mass, force, pressure and density are among the most commonly made in everyday life. All of these measurements are derived from the SI unit of mass, the kilogram.

NPL's activity in this area underpins the work of a wide range of industries, from providing traceability for very small weights used in the pharmaceutical industry to testing bridge bearings with loads of thousands of tonnes.


NPL's Measurement Network has an Engineering & Optical Special Interest Group where relevant news and details of events can be found.

The kilogram

Find out more about the kilogram on our SI units page


Please note that the information will not be divulged to third parties, or used without your permission