John Hart wrote:
The English system evolved to fit human needs.
The English system was based on things that were convenient at the time, but are completely arbitrary, such as foot, barrel etc. Often, units with the same name will vary in size, depending on context, such as gallon, ounce (volume or weight?), mile, foot, ton etc. The metric system is a rational, consistent system based on physical properties and relationships. Again, if you want to "guestimate" by eye ratios such as 1/2, 1/3 etc., it makes no difference which system you use.
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