dimensionless
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dimensionless 〔ｄｉｍ´ｅｎ∫∂ｎｌｉｓ〕 크기가 없는(길이도 폭도 두께도 없는 점)
[百] 무차원수 (無次元數) dimensionless number
dimensionless 차원없음,본없음
dimensionless : 1)무차원 2)무단위
dimensionless equation : 무차원식
dimensionless group : 무차원군
dimensionless number : 무차원수
activity (활성도, 활동도) 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, electrode potentials, osmotic
pressure, boiling point elevation, freezing point depression, and vapour pressures of
volatile solutes are converted from approximations that hold only for dilute solutions to
exact equations that hold for all concentrations. The activity is equal to the product of
the concentration and the activity coefficient, a dimensionless number measuring
deviation from nonideality. Symbol a. 3. radioactivity; the number of disintegrations per
unit time of a radioactive material, measured in curies or becquerels. Symbol A. 4.
optical activity.
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