Browse Definitions:
Definition

# amount of substance concentration

Amount of substance concentration, often called simply concentration, is a quantitative measure of the number of atom s per unit volume in a sample of a matter . The matter might be in the solid, liquid, or gaseous state.

The standard unit of concentration is the mole per meter cubed (mol/m 3 or mol · m -3 ). One mole represents approximately 6.022169 x 10 23 particles, usually atoms. Alternatively, concentration can be expressed in moles per centimeter cubed (mol/cm 3 or mol · cm -3 ). To convert from mol/m 3 to mol/cm 3 , multiply by 10 -6 (0.000001). Conversely, multiply by 10 6 (1,000,000).

For a sample of a specific pure elemental substance, the concentration is directly proportional to the density . However, concentration is not proportional to density in general. Consider a cubic meter of space containing one mole of hydrogen atoms. This is about 1/16 the density of a cubic meter of space containing one mole of oxygen atoms, because the mass of an oxygen atom is approximately 16 times the mass of a hydrogen atom. This is true even though the amount-of-substance concentrations of the two parcels are identical.

Also see amount of substance , density , meter cubed , mole , SI (International System of Units), and Table of Physical Units .

This was last updated in September 2005

#### Start the conversation

Send me notifications when other members comment.

Gesponsert von:

## SearchCompliance

• ### risk map (risk heat map)

A risk map, also known as a risk heat map, is a data visualization tool for communicating specific risks an organization faces. A...

• ### internal audit (IA)

An internal audit (IA) is an organizational initiative to monitor and analyze its own business operations in order to determine ...

• ### pure risk (absolute risk)

Pure risk, also called absolute risk, is a category of threat that is beyond human control and has only one possible outcome if ...

## SearchSecurity

• ### federated identity management (FIM)

Federated identity management (FIM) is an arrangement that can be made among multiple enterprises to let subscribers use the same...

• ### cross-site scripting (XSS)

Cross-site scripting (XSS) is a type of injection security attack in which an attacker injects data, such as a malicious script, ...

• ### firewall

In computing, a firewall is software or firmware that enforces a set of rules about what data packets will be allowed to enter or...

## SearchHealthIT

• ### 21st Century Cures Act

The 21st Century Cures Act is a wide-ranging healthcare bill that funds medical research and development, medical device ...

• ### vendor neutral archive (VNA)

A vendor neutral archive (VNA) is a technology that stores medical images in a standard format and interface, making them ...

• ### HITECH (Health Information Technology for Economic and Clinical Health) Act of 2009

The HITECH (Health Information Technology for Economic and Clinical Health) Act of 2009 is legislation that was created to ...

## SearchDisasterRecovery

• ### business continuity and disaster recovery (BCDR)

Business continuity and disaster recovery (BCDR) are closely related practices that describe an organization's preparation for ...

• ### business continuity plan (BCP)

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

• ### call tree

A call tree -- sometimes referred to as a phone tree -- is a telecommunications chain for notifying specific individuals of an ...

## SearchStorage

• ### volume manager

A volume manager is software within an operating system (OS) that controls capacity allocation for storage arrays.

• ### external storage device

An external storage device, also referred to as auxiliary storage and secondary storage, is a device that contains all the ...

• ### NetApp SolidFire

NetApp SolidFire is a business division of NetApp Inc. that specializes in all-flash storage systems.

## SearchSolidStateStorage

• ### hybrid hard disk drive (HDD)

A hybrid hard disk drive is an electromechanical spinning hard disk that contains some amount of NAND Flash memory.

Close