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Without standardized units, it would be extremely difficult for scientists to express and compare measured values in a meaningful way (Figure 1.13). English units were historically used in nations once ruled by the British Empire.
To answer these questions, they make measurements with various instruments (e.g., meter stick, balance, stopwatch, etc.).
By 1960, some distances could be measured more precisely by comparing them to wavelengths of light.
The meter was redefined as 1,650,763.73 wavelengths of orange light emitted by krypton atoms.
Preparation and properties of complex substances, such as alloys, biological molecules, and pharmaceuticals agents, are considered in specialized fields of chemistry.
Chemistry is sometimes called the central science because it bridges other natural science like PHYSICS, GEOLOGY and BIOLOGY.