UK Metric Association
https://ukma.org.uk
Metric System – The International System of Units (SI)
https://metricsystem.net
Metrication UK – Going Metric in the UK
https://metrication.uk
Dr Metric – educational problems caused by the continued use of medieval units in Great Britain.
https://drmetric.wordpress.com/
Gov.uk website – about weights and measures and use of metric
https://www.gov.uk/weights-measures-and-packaging-the-law
UK Metrication – archived information
http://www.dti.gov.uk/ccp/topics1/metric.htm
Weights and Measures Law – weights and measures law
https://www.gov.uk/guidance/national-regulation-weights-and-measures
Metrication Matters – What is metrication and why does it matter?
http://www.metricationmatters.com
International Standard Paper Sizes
https://www.cl.cam.ac.uk/~mgk25/iso-paper.html
http://www.askprint.co.uk/howto/iso-paper-sizes.php
Metrication – lots of helpful info and converters
http://www.metrication.com
Metric to Metric conversions (short quiz)
https://www.thoughtco.com/metric-to-metric-conversions-quiz-4052360
Interactive animation – showing how big very small things are
https://www.cellsalive.com/howbig.htm
Scale of the Universe – Interactive animation showing how metric can measure any scale in the universe
https://scaleofuniverse.com/
Powers of Ten – A film made in 1977, dealing with the relative size of things in the Universe, and the effect of adding another zero
https://www.youtube.com/watch?v=0fKBhvDjuy0
United States Metric Association
https://usma.org
US National Institute for Standards and Technology – about units and constants
https://physics.nist.gov/cuu/Units/index.html
More Than A Mile Behind – America and the metric system
https://milebehind.wordpress.com
Think Metric sign at US-Canada border
http://mentalfloss.com/article/50160/years-ken-butcher-was-sole-employee-us-metric-program
Metric Road Signs Seen in the USA
https://usma.org/metric-signs
International Bureau of Weights and Measures (BIPM)
https://www.bipm.org/en/about-us/
One Metre – archived Canadian metric site
http://archive.li/NGjr4
SI units – NPL is the UK’s National Measurement Institute
https://www.npl.co.uk/si-units
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