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activity |
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activity 1. the number of disintegrations of a radioactive substance in a given unit of time, usually expressed in curies or disintegrations per second 2. a. the capacity of a substance to undergo chemical change b. the effective concentration of a substance in a chemical system. The absolute activity of a substance B, λB, is defined as exp (μBRT) where μB is the chemical potential activity [‚ak′tiv·əd·ē] (computer science) The use or modification of information contained in a file. (nuclear physics) The intensity of a radioactive source. Also known as radioactivity. (physical chemistry) A thermodynamic function that correlates changes in the chemical potential with changes in experimentally measurable quantities, such as concentrations or partial pressures, through relations formally equivalent to those for ideal systems. (systems engineering) The representation in a PERT or critical-path-method network of a task that takes up both time and resources and whose performance is necessary for the system to move from one event to the next. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Adaptation is merely a secondary activity, a mere re- activity (see Note on Chapter LVII. Captain Wentworth, with five-and-twenty thousand pounds, and as high in his profession as merit and activity could place him, was no longer nobody. He felt that there must be a reason for their strange activity and their inclination to keep hidden away and only a growing respect for Wing Biddlebaum kept him from blurting out the questions that were often in his mind. |
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