it's not as bad as people say it is (but it is still pretty bad)

the chart: https://upload.wikimedia.org/wikipedi...
NIST handbook appendix C: https://www.nist.gov/system/files/doc...
Revised Unit Conversion Factors: https://www.nist.gov/pml/us-surveyfoo...
Weights and Measures Act 1985 Schedule 1: https://www.legislation.gov.uk/ukpga/...

see also:
https://en.wikipedia.org/wiki/Fahrenh...
https://en.wikipedia.org/wiki/Obsolet...
https://en.wikipedia.org/wiki/Chi_(un...

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