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New Theories / Re: Can conscious thought act on matter?
« on: 28/06/2022 09:35:50 »
" Can conscious thought act on matter?"
If it didn't, we wouldn't know it existed (other than our own).
If it didn't, we wouldn't know it existed (other than our own).
The following users thanked this post: Alex Dullius Siqueira
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Physiology & Medicine / Re: The crucial ingredients of CBD:
« on: 21/06/2022 17:36:21 »
I'm just waiting for the spam advertising.
The following users thanked this post: SeanB
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Physics, Astronomy & Cosmology / Re: Is there a net heat exchange between water and ice at 0 degree C?
« on: 16/06/2022 21:06:14 »I'm going to say no, not reliably or meaningfully.Others may differ
http://users.mrl.illinois.edu/cahill/intel08.pdf
But if you asked about a nanometre cubed, it would be tricky.
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Technology / Re: What Is The Benefit Of Cryogenically Treating Cables ?
« on: 16/06/2022 13:53:48 »You have to get copper down to 35K before it becomes superconductingI'm fairly sure that copper doesn't superconduct even at much lower temperatures than that.
The following users thanked this post: evan_au
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That CAN'T be true! / Re: hydrinos!
« on: 10/06/2022 21:39:07 »Randall mills claims he can lower the ground state 1s electron of a hydrogen atom to a lower level producing energy in the processMaybe.
But he hasn't shown anyone else that he can do it, not has he shown anyone else how to do it.
So his claim looks a lot like saying there are fairies at the bottom of the garden.
The following users thanked this post: paul cotter
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Physics, Astronomy & Cosmology / Re: Is there a net heat exchange between water and ice at 0 degree C?
« on: 08/06/2022 21:39:20 »
It's not how well tested the laws of thermodynamics are that matters here.
Again, it's Galileo dropping things off a tower.
He did not need to do the experiment.
He knew that the light thing and the heavy thing had to fall at the same speed- because he had considered what would happen if you tied a heavy ball to a light ball and dropped both.
The combined "thing" consisting of the two balls would obviously weigh more than the constituents.
So, if Aristotle had been right, the combination would fall faster than the heavy ball.
And the light ball would fall more slowly.
But how could the combined thing fall faster then the heavy ball when the light ball was trying to fall slower?
It's impossible.
Galileo knew that.
He only did the experiment for the benefit of the local dignitaries who were not clever enough to understand the logic.
Now we are looking at the laws of thermodynamics, rather than falling objects.
But, like Galileo, we have the advantage of a deep understanding.
We have known for a hundred years or so that momentum, angular momentum and energy are conserved.
We don't rely on experiments to know this.
We have a mathematical proof.
https://en.wikipedia.org/wiki/Noether%27s_theorem
And yet, we still have hamdani yusuf saying that, because he can't do a proper experiment, he doesn't believe it.
He refuses to learn, or even accept the science.
You can lead a horse to water, but you can't make it drink.
He is even less well informed that those local busybodies for whom Galilei had to climb the tower and drop stuff.
Again, it's Galileo dropping things off a tower.
He did not need to do the experiment.
He knew that the light thing and the heavy thing had to fall at the same speed- because he had considered what would happen if you tied a heavy ball to a light ball and dropped both.
The combined "thing" consisting of the two balls would obviously weigh more than the constituents.
So, if Aristotle had been right, the combination would fall faster than the heavy ball.
And the light ball would fall more slowly.
But how could the combined thing fall faster then the heavy ball when the light ball was trying to fall slower?
It's impossible.
Galileo knew that.
He only did the experiment for the benefit of the local dignitaries who were not clever enough to understand the logic.
Now we are looking at the laws of thermodynamics, rather than falling objects.
But, like Galileo, we have the advantage of a deep understanding.
We have known for a hundred years or so that momentum, angular momentum and energy are conserved.
We don't rely on experiments to know this.
We have a mathematical proof.
https://en.wikipedia.org/wiki/Noether%27s_theorem
And yet, we still have hamdani yusuf saying that, because he can't do a proper experiment, he doesn't believe it.
He refuses to learn, or even accept the science.
You can lead a horse to water, but you can't make it drink.
He is even less well informed that those local busybodies for whom Galilei had to climb the tower and drop stuff.
The following users thanked this post: paul cotter
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Chemistry / Re: Why is Armstrong's mixture so sensitive?
« on: 07/06/2022 18:46:34 »
I read that part of the reason why mixtures of sulphur and chlorates are so unstable is something like this:
the sulphur is attacked, even at room temperature, by oxygen.
That produces sulphur dioxide and that, together with water in the air is acidic.
That acid reacts with the chlorate releasing oxides of chlorine.
Those react with the sulphur to produce more acid(s).
The reaction is "autocatalytic".
The heat generated also speeds up all of the reactions.
I suspect something similar happens with phosphorus.
the sulphur is attacked, even at room temperature, by oxygen.
That produces sulphur dioxide and that, together with water in the air is acidic.
That acid reacts with the chlorate releasing oxides of chlorine.
Those react with the sulphur to produce more acid(s).
The reaction is "autocatalytic".
The heat generated also speeds up all of the reactions.
I suspect something similar happens with phosphorus.
The following users thanked this post: paul cotter
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Plant Sciences, Zoology & Evolution / Re: Do Spiders Cooperate ?
« on: 28/05/2022 17:23:27 »
Do Spiders Cooperate ?
They mate.
They mate.
The following users thanked this post: neilep
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General Science / Re: Are Black Holes The Blackest Things Ever ?
« on: 27/05/2022 15:55:29 »They're not perfectly black, but they're blacker than a place in space with no stars in it.Why is the one in the middle winking at us?
The black sheep don't quite win, but close.
The following users thanked this post: neilep
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Chemistry / Re: How can I find the optimum ΔH and ΔS for passive T control?
« on: 27/05/2022 09:00:21 »
While it's true that ΔS ≈ ΔH / 300 is pretty much the criterion for optimal regulation at 300K, it is just restating the requirement that the melting point is near 300.
And tables of melting points are easier to find than tables of ΔS
It's also worth thinking about the "units".
As Alan didn't notice, ΔH is typically given per mole or per unit mass.
On a practical basis you might want to look at the value per cubic metre.
And then you need to look at ΔH per £.
And tables of melting points are easier to find than tables of ΔS
It's also worth thinking about the "units".
As Alan didn't notice, ΔH is typically given per mole or per unit mass.
On a practical basis you might want to look at the value per cubic metre.
And then you need to look at ΔH per £.
The following users thanked this post: chiralSPO
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Chemistry / Re: What colour is paint before the colour is added?
« on: 18/05/2022 18:32:01 »
It seems unlikely that the OP is going to return to a decade-old post.
Just in case they do- until you add the pigment, you don't have paint. So the question makes no sense.
Just in case they do- until you add the pigment, you don't have paint. So the question makes no sense.
The following users thanked this post: SeanB
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Chemistry / Re: How well understood is the Chemistry of the trans-uranic elements?
« on: 17/05/2022 21:38:22 »
For a given definition of "industrial", Californium (98) also has uses- as a neutron source.
Perhaps more relevantly, the colours of some of its compounds have been observed.
Perhaps more relevantly, the colours of some of its compounds have been observed.
The following users thanked this post: Eternal Student
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Chemistry / Re: How well understood is the Chemistry of the trans-uranic elements?
« on: 16/05/2022 21:29:28 »adding a handful of singly (or doubly) positively charged ligands at a radius of 150 picometersHow would you get them to stay (either near to your centre atom or even to each other)?
Essentially, in order to change the rate of a nuclear reaction you have to change the energies involved by an amount comparable with the decay energy.
And the problem is that chemical energies- like ligands are about a million times smaller than typical nuclear energies.
The following users thanked this post: Eternal Student
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Chemistry / Re: Another light scattering question; colour of an alien sky?
« on: 16/05/2022 10:21:44 »
Blue- unless it's cloudy.
The following users thanked this post: Brown1anPantal0ons
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New Theories / Re: what is temperature?
« on: 09/05/2022 13:00:33 »Why don't polyatomic gases rotate nor vibrate at low temperature?Because the energy available to them is less than that required to get them to rotate or vibrate.
Is vibrational energy also quantized?Yes.
QM is not important.Yes it is.
What's the minimum non-zero quantity of of rotational energy?It depends on the molecule.
For N2 I think it's about 10^-4 eV.
The following users thanked this post: hamdani yusuf
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Technology / Re: Are electric cars responsible for natural gas demand?
« on: 30/04/2022 12:29:39 »I'm all for the electrification of transport. Underground railways and trolleybuses are great, and electric cars are terrific fun to drive.But we don't have (and can't have) enough electricity from non-fossil sources to abandon gasoline, diesel, and gas-generated electricity to meet current and predicted demand.And when the oil runs out, we won't have gasoline and diesel.
So we had better start planning to decarbonise the economy now, while we still can.
The following users thanked this post: SeanB
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Chemistry / Re: What happens when Benzalkonium Chloride laundry sanitiser mixes with detergent?
« on: 28/04/2022 18:50:19 »
Anionic and cationic detergents (like benzalkonium) are mutually antagonistic.
It's better not to mix them.
What are you seeking to achieve?
A lot of microorganisms are inactivated by any detergents and, even if they aren't, washing them down the drain largely solves the problem.
It's better not to mix them.
What are you seeking to achieve?
A lot of microorganisms are inactivated by any detergents and, even if they aren't, washing them down the drain largely solves the problem.
The following users thanked this post: DeeDeeDee
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Physiology & Medicine / Re: Can a fungus be a parasite and what distinguishes the two?
« on: 19/04/2022 21:23:39 »The skin itself was fine up until I used this productI don't understand, surely it was not fine- or why would you have used the product?
The following users thanked this post: Harry01
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Physiology & Medicine / Re: Can a fungus be a parasite and what distinguishes the two?
« on: 19/04/2022 21:22:16 »Sorry to clarify. If you don't think a contaminant in the vaseline could cause an ongoing skin condition.Not one that would last this long.
Incidentally, Vaseline has an odour- a slight one but definite. It smells like mineral oil.
The following users thanked this post: Harry01