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exchemist

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  1. Like
    exchemist got a reaction from Anchovyforestbane in Does Math Fit With Philosophy?   
    You can often write a simple algebraic equation in words. For example Newton's F=ma is "Force equals mass times acceleration. But is that really any clearer to you than F=ma?
     
    It seems to me that, as we are all taught nowadays in school enough maths to be able to understand F=ma, it is not unreasonable to expect that readers can deal with it. But more complicated things will lose readers, inevitably.  
  2. Like
    exchemist got a reaction from Anchovyforestbane in About Table Salt   
    Hazel, you have got this a bit garbled. The formula for table salt is NaCl. The atomic mass of Na is 23. For Cl it is 35.5 (it is not a whole number due to the mixture of isotopes that Cl consists of in nature.) So the molecular weight of NaCl is 23+35.5=58.5, which means it consists of about 40% Na and about 60% Cl.  
    The other chemicals you mention are probably additives, present in small amounts, to stop it clogging in humid conditions and for your health (iodide is added to prevent iodine deficiency for instance see goitre). The fineness of the crystals is a matter of choice in the supermarket.
  3. Like
    exchemist got a reaction from hazelm in Are The Elderly Adults?   
    Shakespeare. It's called "The Seven Ages of Man" and is quite widely quoted. It comes from As You Like It. The full poem is as follows:
     
    All the world's a stage,
    And all the men and women merely players;
    They have their exits and their entrances,
    And one man in his time plays many parts,
    His acts being seven ages. At first, the infant,
    Mewling and puking in the nurse's arms.
    Then the whining schoolboy, with his satchel
    And shining morning face, creeping like snail
    Unwillingly to school. And then the lover,
    Sighing like furnace, with a woeful ballad
    Made to his mistress' eyebrow. Then a soldier,
    Full of strange oaths and bearded like the pard,
    Jealous in honour, sudden and quick in quarrel,
    Seeking the bubble reputation
    Even in the cannon's mouth. And then the justice,
    In fair round belly with good capon lined,
    With eyes severe and beard of formal cut,
    Full of wise saws and modern instances;
    And so he plays his part. The sixth age shifts
    Into the lean and slippered pantaloon,
    With spectacles on nose and pouch on side;
    His youthful hose, well saved, a world too wide
    For his shrunk shank, and his big manly voice,
    Turning again toward childish treble, pipes
    And whistles in his sound. Last scene of all,
    That ends this strange eventful history,
    Is second childishness and mere oblivion,
    Sans teeth, sans eyes, sans taste, sans everything.
     
    I and others often reference these stages as our lives unfold. Having retired a few years ago, I have now moved from the era of the Justice to that of the lean and slippered pantaloon. Second childhood is to come - if I am spared. My father is there now. 
  4. Like
    exchemist got a reaction from hazelm in Are The Elderly Adults?   
    "......The sixth age shifts
    Into the lean and slippered pantaloon,
    With spectacles on nose and pouch on side;
    His youthful hose, well saved, a world too wide
    For his shrunk shank, and his big manly voice,
    Turning again toward childish treble, pipes
    And whistles in his sound. Last scene of all,
    That ends this strange eventful history,
    Is second childishness and mere oblivion,
    Sans teeth, sans eyes, sans taste, sans everything."
  5. Like
    exchemist got a reaction from OceanBreeze in Why Do Jewishes Have High Tendency To Money?   
    Hi, Baloney.
     
    Why do Italian tanks have four reverse gears? 
  6. Like
    exchemist reacted to FalconHoof in How Much Hydrogen In A Litre Of Diesel?   
    Ha. I'm 40. I'm just trying to figure something out, but I'm way out of my industry here. The only answers that Google throws up is stuff about "moles", and stuff like moles=AMUs=grams=moles and so on.
     
    If the average diesel molecule is something like C10H20, then is the mass of diesel 66.66% H and 33.33% C?
     
    Or, as the atomic mass of carbon is 12.0107 compared to hydrogen's 1.0079, does that mean that the Carbon-Hydrogen mass ratio is roughly 12:1?
     
    Thanks
  7. Like
    exchemist got a reaction from jack99 in China Should Pay The Bill For The Coronavirus Pandemic   
  8. Like
    exchemist reacted to jack99 in Did Bill Gates Know What Was Planned Or Is He Psychic?   
    You'd think humanity had never had an outbreak like this before. The fact that these things happen regularly, and the worlds population is around 7.8 billion, with many living in close proximity to each other, i'd say it was more common sense than psychic abilities. The current situation just proves his point.
  9. Like
    exchemist got a reaction from jack99 in Coronavirus Is Fake News   
    This is just shooting the messenger. Fauci knows far more about this than you and there is no reason whatever to think he is playing this crisis for personal advantage, as you so unpleasantly suggest.  
     
    But at least all pretence that you are arguing scientifically can now be dispensed with. Perhaps you think the full hospitals in New York, like those in London, Italy and Spain are fake news, too. 
     
    The numbers will go up for quite a while yet, especially in those areas have not got a full lockdown. In London we have been locked down for a fortnight and the rise in hospital admissions is, finally, starting to look linear rather than exponentially increasing. The London doctors are now thinking they might just manage to deal with the surge, albeit at the cost of requisitioning the largest exhibition hall in the city and turning it into a giant 4000 bed ICU. If we had stuck to the feeble social distancing measures you affect to think sufficient, the curve would still be an exponential and we would be heading for disaster.  
     
    You are talking out of your arse. 
  10. Like
    exchemist got a reaction from GAHD in Why Do Jewishes Have High Tendency To Money?   
    Hi, Baloney.
     
    Why do Italian tanks have four reverse gears? 
  11. Like
    exchemist reacted to OceanBreeze in Doppler Effect Of Gravitational Field   
    Time to move this to alternate theories.
  12. Like
    exchemist got a reaction from sanctus in Coronavirus Is Fake News   
    Depends what you mean by "panic". 
     
    Let me reiterate: the issue is not the death rate per se, it is the overloading, and the possible collapse, of the health system due to the predicted incidence of severe cases if everyone is allowed to get it all at once.
     
    If the health system is overloaded, a lot more people - young and old -  will die of all the other conditions that hospitals will no longer have capacity to treat. 
  13. Like
    exchemist got a reaction from OceanBreeze in Coronavirus Is Fake News   
    My guess is there are at least 100,000 in London alone, from the proportion of my contacts and their contacts that have had it.  
  14. Like
    exchemist reacted to OceanBreeze in Coronavirus Is Fake News   
    That death rate is meaningless unless you know the true number of people who are infected.
     
    Do you claim that 6650 is the true number of infected in the UK?
  15. Like
    exchemist reacted to OceanBreeze in What Is "movement" In Physics?   
    While “movement” is close, the correct term in physics is motion, and quite a lot can be said about it!
     
    In physics, motion is the change in the position of an object over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time. The motion of a body is observed by attaching a frame of reference to an observer and measuring the change in position of the body relative to that frame.
     
  16. Like
    exchemist reacted to OceanBreeze in Coronavirus Is Fake News   
    Thanks for that feedback.
     
    My attention was drawn in particular to the following paragraphs:
     
    "In an autopsy series that tested for respiratory viruses in specimens from 57 elderly persons who died during the 2016 to 2017 influenza season, influenza viruses were detected in 18% of the specimens, while any kind of respiratory virus was found in 47%. In some people who die from viral respiratory pathogens, more than one virus is found upon autopsy and bacteria are often superimposed. A positive test for coronavirus does not mean necessarily that this virus is always primarily responsible for a patient’s demise"
     
    "If we assume that case fatality rate among individuals infected by SARS-CoV-2 is 0.3% in the general population — a mid-range guess from my Diamond Princess analysis — and that 1% of the U.S. population gets infected (about 3.3 million people), this would translate to about 10,000 deaths. This sounds like a huge number, but it is buried within the noise of the estimate of deaths from “influenza-like illness.” If we had not known about a new virus out there, and had not checked individuals with PCR tests, the number of total deaths due to “influenza-like illness” would not seem unusual this year. At most, we might have casually noted that flu this season seems to be a bit worse than average. The media coverage would have been less than for an NBA game between the two most indifferent teams"
     
    "Yet if the health system does become overwhelmed, the majority of the extra deaths may not be due to coronavirus but to other common diseases and conditions such as heart attacks, strokes, trauma, bleeding, and the like that are not adequately treated. If the level of the epidemic does overwhelm the health system and extreme measures have only modest effectiveness, then flattening the curve may make things worse: Instead of being overwhelmed during a short, acute phase, the health system will remain overwhelmed for a more protracted period. That’s another reason we need data about the exact level of the epidemic activity"
     
    So, it seems to me the main thing we need to do is not overwhelm the health care system. We can do that by staying home when we feel sick and not running to the hospital, taking a bed away from someone who really needs it. Social distancing is important, as well as tried-and-true common-sense hygiene. Confining people to their homes may do more harm than good and people can only take so much government pushing them around. If riots break out, and that is a possibility, we are all in big trouble.
  17. Like
    exchemist got a reaction from OceanBreeze in Coronavirus Is Fake News   
    Very good and thought-provoking article on the science, I agree. He makes a good case for some kind of properly controlled testing of a sample population, to get at the real numbers.
     
    Unfortunately, however, given the lack of this data, policymakers have to make policy, under intense public pressure and with extremely tight deadlines for action, without it. No democratic leader in the modern world can go to his electorate and say: "We've decided to accept an unknown but significant elderly death toll, because of the economic damage if we try to stop it.". (Even the brutal Chinese did not go that route, interestingly. But then Asian societies do tend to respect the elderly, so perhaps that's why.) 
     
    The image of the elephant jumping off a cliff is dramatic but merely emotional. He is referring there to the scale of economic and social damage resulting from the current measures. We can all agree it will be vast, but he has no data to quantify his worries, nor does he have expertise in economics, so his guess is only as good as that of the man in the pub (who is no longer in the pub, as of yesterday).  
     
    I think his article would have more power if he had concluded with a firm proposal for the kind of data gathering he points out we need, with an estimate of timeline and resources, and what he thinks policymakers should do,  while they wait for this data to come in.  
  18. Like
    exchemist reacted to Flummoxed in Coronavirus Is Fake News   
    The typical death rate from the published figures is approx 3% of those who are confirmed to have been infected. Not everyone will be infected, so this is not 3% of the over all population. The overall number of the population being infected will depend on containment measures implemented, and will differ from country to country and region to region in those countries due to geography, climate, population density and demographics etc. People living and working in the country, are less likely to be exposed than those living a city, doing a commute on mass transit systems every day.
     
    Isolation, appears to be the best protection. Whisky does not work, and city dwellers jumping into their camper vans and heading for the country does not help contain the virus. 
  19. Like
    exchemist reacted to OceanBreeze in Coronavirus Is Fake News   
    I'm not against some of the measures. I agree with social distancing and other common-sense measures including increasing the available number of hospital beds and ventilators, respirators, masks etc.
    I don't see the point of bringing the entire country to a standstill; that is insane.
     
    Here is an excellent article by someone who is very well qualified to write on this issue.
     
    He has one estimate that the case fatality ratio in the general US population may be as low as 0.05% which
    is not much different than the seasonal flu. I would be interested in knowing what you think of his article.
  20. Like
    exchemist reacted to TonyYuan2020 in Doppler Effect Of Gravitational Field   
    x = -v
    Your scene is: x = (u+w)/(1+uw/c^2) = 0.862c ==> w=(x-u)/(1-ux/c^2)
    E---------------------->A-------------------->B-------------------->E
    .........u=0.2C...........................w=0.8C....................x=0.86C;
    The combination of these three data (0.2, 0.8, 0.86) according to the formula must be right.
     
    My scene is :w=(u+x)/(1+ux/c^21)=0.8C
    B---------------------->E--------------------->A--------------------->B
    ................x=0.714C...................u=0.2C.....................w=0.8C
    The combination of these three data (0.714, 0.2, 0.8C according to the formula must be right.
    That's why we're different: (x-u)/(1-ux/c^2) != (u+x)/(1+ux/c^21).
    Why does this happen? The reason for this difference is that my scene has changed the position of the earth.
    Janus's : Earth......A...........B
    mine: B..........Earth........A
    So we only know the relative velocity between A,B and we don't know the position of the earth, we can't calculate the relative velocity to the earth. Even they're very close.
     
    I give up looking for breakthroughs in the formula of special relativity. Those are mathematics, there will be no flaws. We focus on the bending of the light.
  21. Like
    exchemist reacted to OceanBreeze in Doppler Effect Of Gravitational Field   
    That is just one of the hallmarks of the true crank; when they go around saying they have "won" an argument with Einstein!
     
    I have no patience for this sort of thing.Sometimes even a blind squirrel can find a chestnut, so I read the thread but I'm not interested in joining in.
  22. Like
    exchemist got a reaction from OceanBreeze in Doppler Effect Of Gravitational Field   
    No, you have not "won" anything. Janus and Halc have just pointed out where you have made mistakes in your algebra. Again.  Since you do not know what you are doing, it is not surprising you get silly answers. It is not SR's fault. 
     
    P.S. But I see where you are going, now. You will bore the arse off everyone with more and more scenarios until they stop replying - and then claim "victory". You can obviously do that: Janus is a patient scientist, but even he will have his limit of endurance with someone determined not to learn. The the only person you will be fooling will be yourself, though. You won't have persuaded any other reader on the forum - we see people like this every month. 
  23. Like
    exchemist reacted to OceanBreeze in Doppler Effect Of Gravitational Field   
    I did notice your red stamp in this thread.
     
    I didn't remove it. :)
  24. Like
    exchemist reacted to OceanBreeze in Alcohols Help   
    I need to be careful what I say since NOAA haven't issued any public statement yet.
     
    It is COVID-19. We need some official position on continuing sea trials, about the need to get the crew tested, that sort of thing.
     
    Nothing serious and if I have to be stranded, I can think of far worse places.
  25. Like
    exchemist got a reaction from OceanBreeze in Alcohols Help   
    Yup exactly. 
     
    Re conditions, have you not been taught something about conditions for use of K2Cr2O7?  If not, you can see something about it here: https://www.chemguide.co.uk/organicprops/alcohols/oxidation.html
     
    Are you OK now? I have to pop out for an hour or so but should be on line later if you still need help. 
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