The Delisle scale (°D) is a temperature scale invented in 1732 by the French astronomer Joseph-Nicolas Delisle (1688–1768). Delisle was the author of Mémoires pour servir à l'histoire et aux progrès de l'Astronomie, de la Géographie et de la Physique (1738).
== HistoryEdit ==
In 1732, Delisle built a thermometer that used mercury as a working fluid. Delisle chose his scale using the temperature of boiling water as the fixed zero point and measured the contraction of the mercury (with lower temperatures) in hundred-thousandths. Delisle thermometers usually had 2400 or 2700 graduations, appropriate...
@Abhirikshma As far as I remember, if the electronegativity difference between two atoms is more than 1.4, it's an indication that the bond is closer to ionic. The less the difference, the more covalent the bond is.
The tea with sugar added in the first problem begins to cool. You notice that the tea begins to get cloudy and a white powder begins to form on the bottom of the cup.
What is happening and why does this process occur?
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hi. I am trying to numerically integrate and the spectral overlap integral using the trapezoidal rule. However, I think the units gets messed during the approximation. The integral is $\int F(\lambda) \epsilon (\lambda) \lambda^4 $. So, if the wavelength is in m, and the molar absorption coefficient is in m^2/mol, the integral should come out in m^6/mol. However, looking at the trapezoidal rule: