MKS units
Coherent measurement system that evolved into the International System of Units.
The MKS system (metre, kilogram, second) is a coherent system of measurement that served as the foundation for the modern International System of Units (SI). It was formalized in the late 19th century and later extended with additional base units, becoming the basis for scientific and practical measurement worldwide.
- field
- Physical measurement systems
- known_for
- Base units of metre, kilogram, and second; precursor to the International System of Units (SI)
Lore & Background
By the mid-19th century, scientists demanded a coherent system of units, where all units derive directly from base units without conversion factors. The International Electrotechnical Commission adopted this as the M.K.S.
Reader's Guide
The MKS system is significant as the direct precursor to the International System of Units (SI), which is now the global standard for measurement. Its coherence—where derived units like the newton (kg·m/s²) are defined without conversion factors—made it practical for commerce, engineering, and science. Although SI has been redefined based on fundamental physical constants, it still closely approximates the original MKS units for most practical purposes. The MKS system's legacy lies in providing a stable, coherent framework that enabled international standardization and the eventual creation of the modern metric system.
Did You Know?
- The MKS system with the ampere as a fourth base unit is sometimes called the MKSA system.
- The International System of Units (SI) was originally created as a formalization of the MKS system.
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