Look up: activity

1. Activity
   In effect means:- 'how much Radioactive material' - in terms of rate of transformations where 1 Becquerel (Bq) =1 transformation per second.
   Found on http://www.ionactive.co.uk/glossary.html
   
   
2. activity
   [n] - (chemistry) the capacity of a substance to take part in a chemical reaction 2. [n] - any specific activity
   Found on http://www.webdictionary.co.uk/definitio
   
   
3. Activity
   Attribute of an amount of a radionuclide. It is used to describe the rate at which transformations occur in it. Unit: becquerel, symbol: Bq. 1 Bq = 1 transformation per second.
   Found on http://www.encyclo.co.uk/local/20474
   
   
4. Activity
   The activity of a sample of radioactive material is the number of disintegrations per second taking place in that particular sample. The SI unit of activity is the becquerel (Bq)
   Found on http://www.users.zetnet.co.uk/computing/
   
   
5. Activity
   The rate at which a collection of radioactive nuclei decay. One curie corresponds to 3.7x10¹⁰ decays per second. See also: Curie, Radioactive Decay.
   Found on http://www.diracdelta.co.uk/science/sour
   
   
6. Activity
   The number of disintegrations per unit time inside a radioactive source. Expressed in becquerels
   Found on http://www.encyclo.co.uk/local/20725
   
   
7. activity
   (a) An effective concentration used in thermodynamic calculations in place of the actual concentration to allow equations developed for ideal solutions to be used to treat real solutions.
   Found on http://antoine.frostburg.edu/chem/senese
   
   
8. activity
   Activity (a) is a thermodynamic function used in place of concentration in equilibrium constants for reactions involving nonideal gases and solutions. For the species i activity is defined as a = f × c where ai is the activity of the species i, ci is its molar concentration, and fi is a dimensionless quantity called the activity coefficient.
   Found on http://www.ktf-split.hr/periodni/en/abc/
   
   
9. activity
   A measure of the chemical potential of a substance, where chemical potential is not equal to concentration, that allows mathematical relations equivalent to those for ideal systems to be used to correlate changes in an experimentally measured quantity with changes in chemical potential.
   Found on http://www.encyclo.co.uk/local/20742
   
   
10. activity
    1.a term to indicate that a record in a master file is used, altered, or referred to; 2.in PERT and critical path method an activity is the representation on the network of an actual task consuming time and resources necessary for progress from event to another Category: Automation (includes tele...
    Found on http://www.mijnwoordenboek.nl/definition
    
    
11. Activity
    Ac·tiv'i·ty noun ; plural Activities [ Confer French activité , Late Latin activitas .] The state or quality of being active; nimbleness; agility; vigorous action or operation; energy; active force; as, an increasing variet...
    Found on http://www.encyclo.co.uk/webster/A/24
    
    
12. activity
    1. The state of being active, the ability to produce some effect, the extent of some function or action. ... 2. <chemistry> A thermodynamic quantity that represents the effective concentration of a solute in a nonideal solution, if concentrations are replaced by activities, the equations for e...
    Found on http://www.mondofacto.com/facts/dictiona
    
    
13. activity
    noun any specific behavior; `they avoided all recreational activity`
    Found on http://wordnetweb.princeton.edu/perl/web
    
    
14. activity
    (ak-tiv´ĭ-te) the quality or process of exerting energy or of accomplishing an effect. a thermodynamic quantity that represents the effective concentration of a solute in a non-ideal solution. Symbol a. the number of disintegrations per unit of a radioactive material. Symbol A. t...
    Found on http://www.encyclo.co.uk/local/21001
    
    
15. Activity
    • (n.) The state or quality of being active; nimbleness; agility; vigorous action or operation; energy; active force; as, an increasing variety of human activities.
    Found on http://thinkexist.com/dictionary/meaning
    
    
16. activity
    (from the article `liquid`) ...concentration of a substance may not be an accurate measure of its effectiveness, because of physical and chemical interactions, in which case an ...
    Found on http://www.britannica.com/eb/a-z/a/14
    
    
17. activity
    in radioactive-decay processes, the number of disintegrations per second, or the number of unstable atomic nuclei that decay per second in a given ... [1 related articles]
    Found on http://www.britannica.com/eb/a-z/a/14
    
    
18. activity
    1. the state of being active; the ability to produce some effect; the extent of some function or action. 2. a thermodynamic quantity that represents the effective concentration of a solute in a nonideal solution; if concentrations are replaced by activities, the equations for equilibrium constants, ...
    Found on http://users.ugent.be/~rvdstich/eugloss/
    
    
19. activity
    activity 1. The state of being active. 2. Energetic action or movement; liveliness. 3. A specified pursuit in which a person partakes; such as, an educational process or procedure intended to stimulate learning through actual experience. 4. The intensity of a radioactive source. 5. The ability t...
    Found on http://www.wordinfo.info/words/index/inf
    
    
20. activity
    
    • the state of being active
    • an organic process that takes place in the body
    • (chemistry) the capacity of a substance to take part in a chemical reaction
    • a process existing in or produced by nature (rather than by the intent of human beings)
    • radiation resulting from radioactive decay
    • the trait of being active; moving or acting rapidly and energetically
    
    Found on
    
    
21. activity
    A measure of the chemical potential of a substance, where chemical potential is not equal to concentration, that allows mathematical relations equivalent to those for ideal systems to be used to correlate changes in an experimentally measured quantity with changes in chemical potential
    Found on http://www.encyclo.co.uk/local/21115
    
    
22. activity
    quotient, for an amount of radionuclide in a particular energy state at a given time, of dN by dt, where dN is the expectation value of the number of spontaneous nuclear transitions from this energy state in the time interval of duration dt: NOTE - This quantity is expressed in becquerels (Bq).
    Found on http://www.electropedia.org/iev/iev.nsf/
    
    
23. activity
    of an amount of a radionuclide in a particular energy state at a given time, the quotient of dN by dt, where dN is the expectation value of the number of spontaneous nuclear transitions from that energy state in the time interval dt: NOTE - The SI unit of activity is the reciprocal second (s^-1) and is given the special name b...
    Found on http://www.electropedia.org/iev/iev.nsf/
    
    
24. activity
    (a) Type: Term Pronunciation: ak-tiv′i-tē Definitions: 1. electroencephalography The presence of neurogenic electrical energy. 2. physical chemistry an ideal concentration for which the law of mass action will apply perfectly; the ratio of the activity to the true concentration is ...
    Found on http://www.medilexicon.com/medicaldictio
    
    
25. Activity
    (of a component of ideal mixture) A dimensionless quantity whose magnitude is: equal to molar concentration in an ideal solution; equal to partial pressure in an ideal gas mixture; and defined as 1 for pure solids or liquids.
    Found on http://www.chemistry-dictionary.com/defi