Scientists around the world use a common standard unit so that measurements of mass are consistent and comparable. Which SI unit serves this purpose?
Kilogram
The International System of Units (SI) has seven base units; the base unit of mass is the kilogram (kg).
Since 2019 the kilogram is defined by fixing the value of the Planck constant, so every laboratory worldwide can realise the same mass standard — making measurements consistent and comparable.
The pound is an imperial/US customary unit, not SI. The tonne (1000 kg) and the gram (one-thousandth of a kilogram) are derived multiples/sub-multiples, not the SI base unit of mass.
Hence, the answer is Kilogram.
Similar Questions
The masses of atoms and subatomic particles are extremely small, so scientists use the atomic mass unit (u) instead of the kilogram. What is the approximate value of 1 u in SI units?
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