Metric and Imperial units are units of measurements based on different initial standards.
They include such things as length, weight (mass), time etc.
The standard units are given, all other units in the system are derived from the standard units to ensure compatibility within the system
Standard units in the metric system are; (not a complete list)
Length: metre
Mass: kilogram
time : second
In the imperial system the units would be;
Length: yard (since 1958)
Mass: pound
Time : second
There are conversion tables to change one system to another.
For instance you can say 30 mph is equal to 42.28 kph and both parties will know the speed if they use different standards.
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They didn't. Metric Units were developed independently of Imperial units. Originally each country, and sometimes different parts of the same country, had different sets of units. The Metric System was invented to solve the confusion of different units used in different parts of France. Gradually other countries adopted Metric and abolished their own units. The British Imperial units were one of the last to be abolished.
Stones are units of weight in the Imperial Weights & Measures System.
imperial system * * * * * The Metric and Imperial systems are alternative systems! The metric system is properly known as the International System of Units, abbreviated, from its French name: Système international d'unités to SI units.
They are both systems of measurement in which there are sets of 7 units for measuring physical attributes of objects and derived units for measuring other attributes. For example, Basic units for mass: Kilogram (metric) or Pound (Imperial) Derived units for area: Square Metre (metric) or square inch (Imperial) Derived unit for pressure: kg / sq metre = Pascal (metric) or pounds / square inch = psi (Imperial).
Scientific notation is scientific notation - whether it is used for metric units, Imperial units or simply for numbers.