The International System of Units (SI), commonly known as the metric system, is the international standard for measurement. The SI plays an essential role in international commerce and is commonly used in scientific and technological research and development. This cache is part of the SI geoart that allows you to learn about the SI units. Visit the introduction cache to learn more about this geoart.
Amount of substance: mole (mol)
Amount of substance is a standard-defined quantity that measures the size of an ensemble of particles, such as atoms, molecules, electrons, and other particles. The SI unit for amount of substance is the mole. Effective 20 May 2019, the mole is defined as the amount of a chemical substance that contains exactly 6.02214076×1023 (Avogadro constant) constitutive particles. Previously, it was defined based on the number of atoms in 12 grams of carbon-12.
This Geocache
Given 854784mg of pure hydrogen, how many moles of hydrogen atoms are them? Consider its standard atomic weight. Let this number be ABC.
The mole is the seventh SI base unit. In which year did the General Conference on Weights and Measures (CGPM) make the mole a SI base unit? Subtract 1075 from this number to get DEF.
Final coordinates: N 39° 07.ABC W 077° 08.DEF
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Lists of Caches in SI geoart
- introduction
- second and hertz
- metre
- kilogram
- m/s and km/h
- mole
- radian and steradian
- m/s² and newton
- m² and pascal
- joule and watt
- ampere and coulomb
- volt and farad
- ohm
- kelvin
- candela, lumen, and lux
- bushel
- foreword & afterword
- prize distribution