Browse Definitions :
Definition

amount of substance (material quantity)

Amount of substance, also called material quantity, is a dimensionless expression of the number of particles in a sample. The particles are usually atom s, but they can be protons, neutrons, electron s, or more fundamental particles such as quarks. Amount of substance can also be expressed in terms of composite particles such as molecules.

The standard unit of material quantity in the International System ( SI ) is the mole . This unit is based on the mass of 0.012 kilogram (kg), or 12 grams (g), of carbon 12 (C-12), the nucleus of which contains six protons and six neutrons. One mole is equal to approximately 6.022169 x 10 23 , and is also called the Avogadro constant.

Also see atom , mass , mole , and International System of Units ( SI ).

This was last updated in January 2011

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

-ADS BY GOOGLE

File Extensions and File Formats

SearchCompliance

SearchSecurity

  • computer worm

    A computer worm is a type of malicious software program whose primary function is to infect other computers while remaining ...

  • Single Sign-On (SSO)

    Single sign-on (SSO) is a session and user authentication service that permits a user to use one set of login credentials (e.g., ...

  • Certified Information Systems Auditor (CISA)

    Certified Information Systems Auditor (CISA) is a certification issued by ISACA to people in charge of ensuring that an ...

SearchHealthIT

SearchDisasterRecovery

  • business continuity plan (BCP)

    A business continuity plan (BCP) is a document that consists of the critical information an organization needs to continue ...

  • disaster recovery team

    A disaster recovery team is a group of individuals focused on planning, implementing, maintaining, auditing and testing an ...

  • cloud insurance

    Cloud insurance is any type of financial or data protection obtained by a cloud service provider. 

SearchStorage

Close