Metric system
Query URLs
https://term.museum-digital.de/md-de/tag/39042
- Note
- The metric system is a system of measurement that succeeded the decimalised system based on the metre, which had been introduced in France in the 1790s. The historical development of these systems culminated in the definition of the International System of Units (SI) in the mid-20th century, under the oversight of an international standards body. Adopting the metric system is known as metrication.
The historical evolution of metric systems has resulted in the recognition of several principles. A set of independent dimensions of nature is selected, in terms of which all natural quantities can be expressed, called base quantities. For each of these dimensions, a representative quantity is defined as a base unit of measure. The definition of base units has increasingly been realised in terms of fundamental natural phenomena, in preference to copies of physical artefacts. A unit derived from the base units is used for expressing quantities of dimensions that can be derived from the base dimensions of the system—e.g., the square metre is the derived unit for area, which is derived from length. These derived units are coherent, which means that they involve only products of powers of the base units, without any further factors. For any given quantity whose unit has a name and symbol, an extended set of smaller and larger units is defined that are related by factors of powers of ten. The unit of time should be the second; the unit of length should be either the metre or a decimal multiple of it; and the unit of mass should be the gram or a decimal multiple of it.
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Rechenbuch mit besonderer Rücksicht auf die metrischen Maaße
Rechenbuch mit besonderer...
Object information
Image: Kulturverein Guntersblum - CC BY-NC-SA -
Glasgewichtssatz 1-100g
Glasgewichtssatz Wägestücke...
Object information
Image: Stadt- und Waagenmuseum Oschatz - CC BY-NC-SA
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