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Showing content with the highest reputation on 04/07/21 in all areas

  1. I would like to defer discussion of hydrogen bonding to another thread as it is taking us further and further off topic. The weakest standard bond my copy of Lange's Chemistry Handbook lists is the lithium - Lithium bond at 11 kcal/mol and the strongest hydrogen bond this modern article lists is the formic acid - flouride ion one at 48 kcal/mol (on page 22) https://www.tdx.cat/bitstream/handle/10803/7945/tdhg.pdf?sequence=3Girona But the important point I wanted to make was not the strength if the individual bond but the collective strength of many bonds applied to large mo
    1 point
  2. the matter/antimatter asymmetry is the issue of why we have matter and not antimatter around. The amounts are not equal, or symmetric g-2 refers to the muon magnetic moment experiment, in the nature link I added to my previous post I come from atomic physics, which gave us "optical molasses" and "Bose-nova" (both, I think, from the Wieman and/or Cornell research groups) so don't look to me for help.
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  3. So they say scientists don't know what the force is, exactly, but imply it will explain dark matter, these muon issues, matter/antimatter asymmetry, etc. Also, they imply this is a revelation, when we know the standard model is incomplete. I saw on twitter where it was stated the g-2 results from today used the same storage ring design as the previous results (which showed a similar disagreement with the standard model), meaning you can't rule out some systematic errors. edit: the calculations that incorporate better QCD values narrows the discrepancy between theory an
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  4. There is an informative, though very long, article here about the physics of organ pipes that may be relevant: https://www.academia.edu/24411933/The_Physics_of_Organ_Pipes Buried in this is a bit about the effect of width of the pipe. It seems that a wide pipe is effective at resonating for the lower harmonics only, while a narrower one allows higher harmonics to resonate more and thus sounds brighter. So yes, a softer or mellower tone will be produced by a wider bore, but it may sound rather dull.
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  5. Yes I don't think there are many fridges or freezers on the market without this system +1 You got there before me, but I'll just add my diagram anyway, which shows the back of the device. Most of these have the drip collection and evaporation tray mounted directly on top of the motor to use the small amount of heat the motor generates. The drip tube coming out of the cold compartment is a frequent source of blockage and water collecting inside the device. But the important point here is the word evaporation. I already mentioned that water vapour is invisible in
    1 point
  6. Most of the (electric) fridges I've seen have a water drain to remove condensation from the cold panel (evaporator). This is typically connected to an exterior evaporating trough at the back, warmed by the heat exchanger (condenser) that rejects the heat. It's not a lot of moisture, obviously, but there is a little. And there is certainly warmth. Perhaps it could be primarily an effect of warmth, combined with the natural damp in the walls, or something. P.S. On the subject of gas fridges, I remember someone's girlfriend being conned into thinking that, for caravans, one could hav
    1 point
  7. Could possibly end up something like Venus too. With a day length about 117 times ours, it still maintains about the same temperature planet wide. I was thinking most of the ecology could be airborne, with low lying or anchored surface and underground species providing mineral resources.
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  8. I will never understand this need people have, to 'label' other people. We label them according to perceived aptitudes; those with athletic aptitude are 'jocks', those with technical aptitude are 'nerds'. We label them accordng to the government they need; 'liberals' need a government that takes care of people, 'conservatives' want a government that gets out of their way. We label them according to their roles in society; 'enablers' allow bad stuff to happen, 'complainers' bitch about bad stuff happening. We label them according to their station in life; successful people are seen as '
    1 point
  9. Nature of true original science is NOT hasty. they just needed some vaccine to soothe the populace. Not exactly clear how successful this shall turn out to be. Let alone in other less attractive , less "important" fields . . . .. .
    -2 points
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