Mass
![A {{cvt|2|kg}} cast iron weight used for [[balance (device for weighing)|balances]]](https://upload.wikimedia.org/wikipedia/commons/0/0a/Poids_fonte_2_kg_03_%28cropped%29.jpg)
The SI base unit of mass is the kilogram (kg). In physics, mass is not the same as weight, even though mass is often determined by measuring the object's weight using a spring scale, rather than balance scale comparing it directly with known masses. An object on the Moon would weigh less than it does on Earth because of the lower gravity, but it would still have the same mass. This is because weight is a force, while mass is the property that (along with gravity) determines the strength of this force.
In the Standard Model of physics, the mass of elementary particles is believed to be a result of their coupling with the Higgs boson in what is known as the Brout-Englert-Higgs mechanism. Provided by Wikipedia
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