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John Cuthber

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Posts posted by John Cuthber

  1. 1 hour ago, Longwell3 said:

    Do the bigger chunks rejected by the intestine cause kidney stones?  

    Stuff that's not digested by the intestines leaves by a different route.


    Calcium ions will form a solid precipitate with, for example, phosphate. Calcium phosphate can form kidney stones (and also bones).

    It is still calcium in the form of ions. Calcium metal reacts instantly with water.

  2. 13 hours ago, studiot said:

    Calcium is not absorbed in the stomach,

    I never said it was.

    I said CaCO3 dissolves in the acid in the stomach- it does-and I said that the calcium is absorbed- it is.

    I never said where it was absorbed so...

    13 hours ago, studiot said:

    Please check your facts before you quibble.


  3. 1 hour ago, dimreepr said:

    Curious use of the word humble, in this context,since it's only religion that teaches humility and strangly not off topic.

    Religion(s) tried to pretend that we were the centre of the universe and that other religions were so wrong they were evil and should be killed for it.

  4. There are two major ways that food "goes off".

    • Bacteria or other micro organisms grow on it or
    • it is intrinsically unstable.

    You can kill the bugs by pasteurisation. However, something that has more sugar than anything else is probably not going to be attacked by microbes.

    (Jam is a way of preserving fruit by adding so much sugar that there is not enough water for the bacteria.


    On the other hand, mixtures of fat and water (like butter) are  not stable. Even without bacterial help they go rancid.

    There's not much you can do about that except keep the product cold.


    What happens to the buttercream if you leave it (in a closed container ) for longer than the shelf life?

    That might help you work out how it is going off and that will help you work out how to prevent that change.



  5. 2 hours ago, RaytjeKn said:

    But would like I asked earlier it just be a matter of soldering the wires (PICTURE BLUE) to the ring and removing the epoxy glass (PICTURE YELLOW).

    If you do that the aluminium will short circuit the resistor and you won't get a reading.

    There are glues that will stand 210C without any trouble

    The biggest problem you face is that an object like that ring, in air, doesn't have " a temperature".

    Bit's of it will be warmer than others.

    2 hours ago, RaytjeKn said:

    I think it should be as easy as connecting the wires of my multimeter to the probes of the RTD without any other circuitry, read the readings of the multimeter (Ohms) and see what the according temperature would be.

    It should be.
    It's not going to be the most accurate measurement in the world, but you probably don't need that.

    You can improve the accuracy significantly by putting some sort of insulation on the temperature probe so that   the air doesn't cool it much. A scrap of glass  wool is probably good enough

  6. 2 hours ago, Sensei said:

    Compounds (especially complex organic compounds) heated in oven to couple hundred degrees will decompose to smaller unknown compounds, and eventually get into random reactions with other compounds around them (e.g. other pesticides or by-products of decomposition etc.), and product of reaction might be eventually harmful.

    The toxicologists take this into account.

    It is called "cooking".

  7. Swansont's  actual day to day experience says it is.

    Which are you going to believe?

    Incidentally, if you want the "high school science" explanation, remember that lines of force repel one another.

    So they spread uniformly through the bore of the solenoid in order to keep as far from eachother as possible.

    Why would they not?


  8. 39 minutes ago, swansont said:

    .  In e.g. hydrogen, you could flip the hyperfine state, which is the 1420 MHz transition.

    You can get that transition, but the classical interpretation (i.e. the one involving an actual rotation) is that it is only the electron which spins, not the whole atom.


  9. When the motor is running ,the rotor has a magnetic field, and it is moving post the coils of the stater.

    That moving field and coil of wire generates a voltage. It is traditionally called the "back EMF"

    The voltage opposes that from the mains supply.

    So, the current through the motor depends on the difference between the mains voltage and the back emf.

    If the motor is  run at a low voltage it doesn't spin so fast and there is a smaller magnetic field produced by the rotor.

    So the back emf is lower.

    And so the difference between the mains and the back emf is higher and the motor draws more current.


  10. 4 hours ago, MigL said:

    My understanding ( I'm not an economist either John ) was that economic stimulus, through deficit spending, is provided in bad economic times, while good economic times allow for balanced budgets and re-payment.
    Doing otherwise seems foolish to me.

    Well... yes, I think we can all agree to that (at least in general- there maybe short-term exceptions)

    And, while I realise it's not the right country, I hope you will forgive me for posting this link.
    I'm hoping that someone could do a similar analysis for Canada (and, even the US if they liked)


    Here in the UK (and, of course, it may be different elsewhere) the Right wing Conservative government have consistently borrowed more and paid back less. 

    That seems to me to be running up "bad" debts.

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