Recent content by DrDu

Isn't this a bimolecular reaction?

Hm, I still have some material, but I would rather prefer to exchange it than to sell it. Best against nematophytes from other sites, but also petrified fungal material.

Somewhat oversimplified, I think you can assume that all valence electrons in d-block elements are d-electrons if the atom has a positive oxidation number. The reason is that with increasing atomic charge, the atom gets more hydrogen like and the aufbau principle will be followed (i.e. d will be...

I wholeheartedly agree. But what do you do if you, for example, expect temperature readings in a clinical study from all over the world? I think you should describe as precisely as possible how to interconvert between different scales as possible, because you can't rely on every data manager...

Maybe it is clearest to explain this differently. The difference between absolute Temperature and Celsius or Fahrenheit is not only a change of units but of scale. For the Celsius scale we define a new quantity $$ t =T-T_0,$$ where ##T_0=273.16\; \mathrm{K}##. ##t## may perfectly well be...

This seems at variance with the definition of a physical quantity as, e.g. explained in the document cited above: "The value of a physical quantity Q can be expressed as the product of a numerical value {Q} and a unit [Q] Q = {Q} [Q] (1)Neither the name of the physical quantity, nor the symbol...

Thank you for your answers, I found now that in this IUPAC document . On p. 138 they use ##t_\mathrm{F}## as symbol for temperature on the Fahrenheit scale.

IUPAC recommends T as the symbol for absolute temperature and t or theta for temperature on the Celsius scale. While Fahrenheit scale is not recommended, it is nevertheless widespread and the question arises if there is a widely accepted symbol for the respective quantity.

When I was taught partial derivatives, my prof pointed out to us that there actually is an important difference between thermodynamic notation and mathematical notation: Specifically, we designate for example internal energy always with the letter "U" irrespective whether we assume it to depend...

Nice tree, indeed. Many important finds of the Silurian and Devonian, including equisitely preserved coalified Prototaxites were found in the Welsh borderland, which is not far from Manchester. Not in vain have the epocs of the Silurian been named LLandovery, Wenlock and Ludlow. I would love to...

I would call ##T\sqrt{g_{00}}## the thermodynamical temperature and ##T## the local temperature. thermodynamical temperature is a consequence of the zeroth law of thermodynamics (transitivity of thermal equilibrium). There is no reason to think that it does not hold in gravitational systems. The...

The problem is also how you define temperature. In thermodynamics, systems in thermal equilibrium are defined to have the same temperature. However, this is not the temperature you measure, say, with a mercury thermometer which is the "local temperature". Hence you cannot run a carnot engine...

Maybe you can give some more background on your question. In vacuum, there are no bound charges. So it is not clear what you mean.

You were right pointing out path dependence. Integration of ##p=\nabla_q G## is only possible if ##p## is rotation free. ##p## is essentially ##A##, so we can at best transform away the rotation free part of ##A##. This corresponds to a change to Coulomb gauge.

In QM, one could formally implement this transformation with the unitary ## U(q,t)=\exp(ie\int Adq)##. Again, this is hard to interpret if the integral over ##q## is multi-valued.