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studiot

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Everything posted by studiot

  1. Yes and No or not really. All our theories , including quantum theory, are models which only deal with some aspect or aspects of reality. These are all fine within their respective realms of application. Sometimes different models describe the same aspect. In this case we distinguish between when the different models yield the same answer and when they yield different answers. Objective measurement and observation is the final arbiter. When the predictions are the same it doesn't matter which we choose so we normally use the easiest, most convenient one. But when the give different answers, clearly we must operate the most accurate one.
  2. Could it also be to ask questions of those who know more than they do ? Is that possible ?
  3. Sounds good to say to your mates down the cafe. But don't overthink it. In particular don't mix-n-match quantum theory and mechanical force theory. Orbitals and Pauli theory do not lead to expressions of force, They are energy theories.
  4. Not so sure about this bit from your link. He later contradicts it anyway. No, it's not a limit, but a distance where the system has smallest potential energy. No me Guv, not guilty.
  5. The original theory of touching was put forwrda by Lennard-Jones. Here is a simple version https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Physical_Properties_of_Matter/Atomic_and_Molecular_Properties/Intermolecular_Forces/Specific_Interactions/Lennard-Jones_Potential Wikipedia has a more detailed version with more famous names from the past. https://en.wikipedia.org/wiki/Lennard-Jones_potential
  6. I'm quite sure you are quite well aware of the consequences of this decoupling being possible. It would lead to one of the standard derivations of the second law via a 'self acting machine' i.e. one that can function as part of a machine with a single bath that acts as both source and sink, whilst at the same time magically outputting work. This is commonly known as a perpetual motion machine of the second kind.
  7. @joigus Yes thanks for extending the discussion. I did not know how much new stuff has been done in the last couple of decades. +1
  8. Not in the UK, no because we also have the professional institutes. Nor, I believe in the US since many professionals also have to pass a state professional exam in order to practice. What is the important difference between self study and teaching ? I believe is the the access to 'marked work'. In other words assessment is an essential part of the teaching. It should be noted that assessment measures not only how well the student is faring but also how well the teacher is performing. There has been a definite trend to reducing this in recent years or replacing it with impersonal automated schemes of 'marking' with take away the all important feedback element from teaching. Assessment has disparate roles to play in the learning process and the final outcome and this, in my opinion, requires different methods of assessment for its different purposes. All too often nowadays though they are lumped all into a one-size-fits-all approach in pursuit of 'efficiency' - which has usually beecome degraded into ' solely financial minimisation' efficiency. I don't know if or when AI will become good enough or reliable enough to offer proper final outcome assessment, but it can certainly help both in the self study and taught arenas at the moment.
  9. Very nearly the way my old High school maths teacher taught maths. He was the bst teacher in any subject I ever had. +1
  10. Sounds like pressure pulses from the pump reflecting of the confining walls. Not quite as bad as water hammer, but not what you need either.
  11. Yes you can make it. That is not the problem. The problem is that many (if not all) chemical synthesis methods produce by-products as well. So your synthesis need to to include separating the desired products from the undesirable. Particularly if methanol is a by-product, since methanol is poisonous. So don't try it.
  12. I think OP is referring to Bayesian statistics (conditional probability). The notation P(A|B) means P(A), given B. https://en.wikipedia.org/wiki/Conditional_probability
  13. A further though occurred, The Earth has two fluid environments air, and water. Ther are plenty of free floating plants on/in the water environment, so the idea of a travelling plant is not silly. But the air is much thinner so perhaps only the free floating microorganisms that are plants are possible. Perhaps the biology specialists will advise further.
  14. The results of the New Horizons spacecraft serious suggest that Pluto may be tectonic. It certainly shows vulcanicity - always remembering that the main rock there is ice, not granite.
  15. How does that address my point right at the beginning of my post immediately above your answer ? I also asked you a serious and important question which you did indeed ignore which was designed to help create a simple block diagram to show where you need to concentrate your efforts and why what you are currently doing will not achieve your stated aims. An ideal reservoir is an object that does not change in temperature however much heat is added to it or extracted from it. This is true for both hot and cold reservoirs. But as swansont says they are imaginary ideals. If the if the heat transfer causes a change in temperature it (dramatically) changes the thermodynamics of the system. There are two ways around this in practical reality. One is the very difficult way you are attempting. The other is to find an object with very large heat content compared to the amount of heat transfer. But you did not answer my question as noted above. Verbal sparring with swansont is in my opinion what in the UK we call a 'hiding to nothing'. I think I have only known him being wrong once since I have been a member.
  16. I already noted that is isn't 100%, but that in general 'science does it's best. Good viewpoint. +1 Agreed, the media has widened its scope. Agreed, I think by everybody here. This still misses my main scientific point, although I admit I made it in the same sensationalist manner as the article and rather hoped other technical people would pick up on it rather better than they have.
  17. I presume the waves are surface waves. In general these do not disturb water very deeply. So I would suggest trying a horizontal perforated or cellular plate at or just below, the water surface. Suitable sized and spaced holes would act as resonant absorbers of the waves without causing changes to the flow regime or pressures beneath as the water would 'pump' up and down through the holes. The plate thickness would need to be similar in size to the observed wave heights.
  18. I agree that playing around with ice water / electric heaters / and other devices opens too many cans of worms for satisfactory simple experimentation. You need to arrange both reservoirs so that the heat transferred through the fluid is les than 1% - preferably less than0.1% - of the heat content ofeach reservoir. Do you understand the difference between specific heat (also called heat capacity) and heat content ? For instance using the ocean or a lake etc as the cold reservoir would be really good. Stirling in his original devices used a blast furnace as the hot reservoir.
  19. Since your reply to me was so disrespectful I will simply say here is a good animation of the correct logical thinking I have been promoting and leave you to figure the rest out for yourself. https://www.einstein-online.info/en/spotlight/light-clocks-time-dilation/
  20. OK a few more questions. Are you viewing from the top or the sides (or both) ? You plate idea (as a top plate on the surface) is a likely fix is you don't need top viewing, make it removable for acees though. The test length seems exceedingly short, almost certainly too short for the convergent and divergent orifices effects to be smoothed out. Depending upon the type of pump you are in danger of introducing vertical axis vortices in the outlet, with the diagrammed arrangement. By 'particle' do you mean fluid element or suspended matter. Are you interested in sedimentation rates or differential sedimentation rates .
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