# Type of Substance as a New Physical Quantity

## Abstract

The International System of Units (SI) is founded on 7 SI base units (meter, kilogram, second, ampere, kelvin, mole, candela) for 7 base quantities (length, mass, time, electric current, thermodynamic temperature, amount of substance, luminous intensity) assumed to be mutually independent. There is a need for a new quantity that describes the quality or type of the substance. The processing and introduction of this quantity is investigated. The method of the maximum possible atomic number of elements in *Mendeleev’s Periodic Table* was used. Here is a proposal of the 8th base quantity called *type of substance* and its unit boscovich, B. This quantity cannot be derived from 7 existing quantities and therefore should be introduced as a separate new one. It is also explained why the unit boscovich for type of substance is suggested.

## Keywords

Boscovich Quantity SI units Soddy Structural constant## Notes

### Acknowledgements

Once again, we thank Ms. Srebrenka Ursić and Mr. Damir Vuk for very useful discussions and advices that helped us very much.

Mr. Davor Pavuna has been intensively involved in supporting the project, advocating for its realization and disseminating project information through its contacts.

Mr. Krunomir Dvorski helped with his suggestions that conceptually, besides the protons and neutrons, Soddy’s number also include electrons.

Mrs. Dubravka Brandić kindly helped with the language advice.

Great thanks to Schrack Technik d.o.o. for recognizing this scientific initiative.

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