21
This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.
22
The Environment / Re: Is it possible for hydrogen sulfide clouds to form on Earth?
« on: 11/01/2024 12:49:00 »
How common is it for people to be overcome by gas emissions from swamps?
I know it happens with this sort of thing
https://en.wikipedia.org/wiki/Lake_Nyos_disaster
and even this
https://en.wikipedia.org/wiki/Cave_of_Dogs
I know people get stuck in swamps and die of exposure or drowning.
But I never heard of anyone being gassed.
I know it happens with this sort of thing
https://en.wikipedia.org/wiki/Lake_Nyos_disaster
and even this
https://en.wikipedia.org/wiki/Cave_of_Dogs
I know people get stuck in swamps and die of exposure or drowning.
But I never heard of anyone being gassed.
The following users thanked this post: paul cotter
23
That CAN'T be true! / Re: Is HCQ the antidote to Trump?
« on: 09/01/2024 12:59:31 »
OK, now the dust has settled, someone did the analysis.
https://www.sciencedirect.com/science/article/pii/S075333222301853X
17000 dead as a result of HCQ.
Can one of the mods correct the thread title please?
https://www.sciencedirect.com/science/article/pii/S075333222301853X
17000 dead as a result of HCQ.
Can one of the mods correct the thread title please?
The following users thanked this post: paul cotter
24
Chemistry / Re: Ammonium perchlorate
« on: 09/01/2024 10:10:13 »Is it Toxic &/Or Explosive?https://en.wikipedia.org/wiki/PEPCON_disaster
25
Just Chat! / Re: Why Is English So Simple?
« on: 29/12/2023 18:08:54 »
Before you ask "Why Is English So Simple?"
you should ask
"Is English So Simple?".
And the answer to that is
"can you read this out loud?"
I take it you already know
Of tough and bough and cough and dough
Others may stumble, but not you
On hiccough, thorough, laugh, and through.
And cork and work and card and ward
And font and front and word and sword
Well done! And now if you wish, perhaps
To learn of less familiar traps,
Beware of heard, a dreadful word
That looks like beard and sounds like bird.
And dead: it?s said like bed, not bead?
For goodness sakes don?t call it deed.
Watch out for meat and great and threat,
They rhyme with suite and straight and debt.
A moth is not a moth in mother,
Nor both in bother, broth in brother.
And here is not a match for there,
And dear and fear for bear and pear.
And then there?s dose and rose and lose?
Just look them up?and goose and choose,
And do and go, then thwart and cart.
Come, come, I?ve hardly made a start!
A dreadful language?
Man alive!
I?d mastered it when I was five.
you should ask
"Is English So Simple?".
And the answer to that is
"can you read this out loud?"
I take it you already know
Of tough and bough and cough and dough
Others may stumble, but not you
On hiccough, thorough, laugh, and through.
And cork and work and card and ward
And font and front and word and sword
Well done! And now if you wish, perhaps
To learn of less familiar traps,
Beware of heard, a dreadful word
That looks like beard and sounds like bird.
And dead: it?s said like bed, not bead?
For goodness sakes don?t call it deed.
Watch out for meat and great and threat,
They rhyme with suite and straight and debt.
A moth is not a moth in mother,
Nor both in bother, broth in brother.
And here is not a match for there,
And dear and fear for bear and pear.
And then there?s dose and rose and lose?
Just look them up?and goose and choose,
And do and go, then thwart and cart.
Come, come, I?ve hardly made a start!
A dreadful language?
Man alive!
I?d mastered it when I was five.
The following users thanked this post: Zer0
26
General Science / Re: Is desalinated ocean water just as healthy as any other purified water?
« on: 23/12/2023 16:19:29 »Essentially all fresh water is desalinated ocean water.
Sometimes the desalination process involves the sun + clouds etc.
The following users thanked this post: Zer0
27
Science Experiments / Re: How does microwave superheat water?
« on: 18/12/2023 16:10:52 »On the other hand, in microwave superheating, the boiling can occur long after the heater is turned off, and the water is moved away from the microwave.I assure you that this happens with conventional heating too.
That's the reason for instructions like this
"The avoidance of ?bumping? can be achieved by the addition of pieces of broken pot or special anti-bumping
granules, which promote smooth boiling. Anti-bumping material should only be added to a cold liquid. If there is a
need to add it to a liquid that has already been heated, the liquid should be removed from the heat and allowed to
cool for several minutes, otherwise it may boil over.''
here
https://www.ase.org.uk/sites/default/files/chemistry%20PDFs/PDFs/Anti%20bumping%20granules.pdf
The following users thanked this post: hamdani yusuf
28
New Theories / Re: Solving the puzzle of wave-particle duality, solution of this problem
« on: 13/12/2023 22:40:08 »Can Light be thought of as Water?No
A Single Photon as a Droplet.
& a whole bunch of em as an Ocean.
Because wavelengths don't "mix" when photons collide.
The following users thanked this post: Zer0
29
Chemistry / Re: Will melting Plastic in a tight container exPlode?
« on: 10/12/2023 12:32:34 »
Heating anything in a completely sealed container is a bad idea unless you take suitable precautions.
Why do you want to heat plastic?
Many plastics can be melted in an open container.
Why do you want to heat plastic?
Many plastics can be melted in an open container.
The following users thanked this post: Zer0
30
New Theories / Re: Solving the puzzle of wave-particle duality, solution of this problem
« on: 10/12/2023 09:54:04 »So why, in the double-slit experiment mentioned by Zer0, light manifests itself as a wave phenomenon.Because that's what quantum objects do.
This is a picture of a quagga.
Quagga.png (301.91 kB . 569x399 - viewed 272 times)
From the front it looks like a zebra and from the back it looks like a horse.
Because it sometimes looks like a zebra, we know it is not a horse.
Because it sometimes looks like a horse we know it is not a zebra.
So we know it is "something else". We call that thing a quagga to distinguish it from zebras and horses.
From some viewpoints, light looks like a wave.
From some viewpoints light looks like a particle.
Because it sometimes looks like a wave, we know it is not a particle.
Because it sometimes looks like a particle we know it is not a wave.
So we know it is "something else". We call that thing a quantum object to distinguish it from waves and particles.
There is only a "problem" if you try to pretend that light is a wave or a particle.
To be fair, you can often model it as if it is one or the other.
31
Physiology & Medicine / Re: Wintertime and Hand Washing. Whose Directions Do You Follow?
« on: 09/12/2023 00:37:33 »The Swarfega just removes the barrier creamAnd then stops... by magic.
Because it knows that the greasy stuff that you put on your skin is different from the greasy stuff that's part of your skin.
The following users thanked this post: paul cotter
32
Physiology & Medicine / Re: Does Your Brain Remember Everything?
« on: 06/12/2023 22:55:41 »
I thought I already replied to this...
The following users thanked this post: Zer0
33
Physics, Astronomy & Cosmology / Re: Has E=mc2 been proved practically?
« on: 06/12/2023 13:10:51 »electromagnetic energy is masslessThat's a matter of perspective. Light has no rest mass, but it has relativistic mass.
The following users thanked this post: Zer0
34
Physiology & Medicine / Re: Do tranquilizers really work as fast as we see in crime fiction?
« on: 02/12/2023 22:05:31 »
The idea- popular in cartoons and spy films- that you can knock someone unconscious with a blow to the head and have them recover fully, shortly afterwards, is as much a myth as the "chloroform on a cloth" myth.
It's probably more dangerous too- since not many people have ready access to chloroform.
It's probably more dangerous too- since not many people have ready access to chloroform.
The following users thanked this post: Zer0
35
Physiology & Medicine / Re: Do tranquilizers really work as fast as we see in crime fiction?
« on: 01/12/2023 17:59:59 »
It depends...
But.
" In 1865 as a direct result of the criminal reputation chloroform had gained, the medical journal The Lancet offered a "permanent scientific reputation" to anyone who could demonstrate "instantaneous insensibility", i.e. losing consciousness instantaneously, using chloroform.[62]"
From
https://en.wikipedia.org/wiki/Chloroform#Criminal_use
It would be tricky to balance a high enough dose to get a fast effect vs a dose that kills the person.
Not a problem in the OP's scenario.
This sort of thing is a genuine concern.
https://en.wiktionary.org/wiki/chemical_cosh
But.
" In 1865 as a direct result of the criminal reputation chloroform had gained, the medical journal The Lancet offered a "permanent scientific reputation" to anyone who could demonstrate "instantaneous insensibility", i.e. losing consciousness instantaneously, using chloroform.[62]"
From
https://en.wikipedia.org/wiki/Chloroform#Criminal_use
It would be tricky to balance a high enough dose to get a fast effect vs a dose that kills the person.
Not a problem in the OP's scenario.
This sort of thing is a genuine concern.
https://en.wiktionary.org/wiki/chemical_cosh
The following users thanked this post: Zer0
36
Just Chat! / Re: Would you fart in an elevator?
« on: 29/11/2023 17:19:47 »
Farting in the lift is wrong on many levels.
The following users thanked this post: Zer0
37
Chemistry / Re: A machine that smells as well as a dog
« on: 24/11/2023 16:03:26 »
Two things.
Evolution has about a billion year head start on us and
there's no market because the machine would have to be cheaper to build than a dog.
Evolution has about a billion year head start on us and
there's no market because the machine would have to be cheaper to build than a dog.
The following users thanked this post: Zer0
38
Question of the Week / Re: QotW - 23.11.24 - What can seeds to for our health?
« on: 23/11/2023 19:39:09 »
If you are careless when eating apples you should be glad that the pips go through unchanged.
If chewed they release cyanide- though not enough to do any harm.
Eating seeds is pretty much universal when you think about it; wheat, maize, rice and so on as well as pulses and nuts are essentially seeds.
If chewed they release cyanide- though not enough to do any harm.
Eating seeds is pretty much universal when you think about it; wheat, maize, rice and so on as well as pulses and nuts are essentially seeds.
The following users thanked this post: Zer0
39
General Science / Re: What happens when a superconductor is utilised in a circuit?
« on: 22/11/2023 18:30:48 »
One thing they do with superconductors is make electromagnets.
These often have large inductances.
Let's pick a number out of a hat and say it's 10 henries.
Imagine I connect a power supply to that coil and it has an output voltage of 10 volts.
Initially no current is flowing.
When I make the connection the inductance of the coil limits the rate of change of current.
The current will rise (from zero) initially at 1 amp per second.
After 10 seconds the current flowing will be 10 amps.
Imagine that I have things set up so that the coil is short circuited by a piece of "superconducting stuff" which is too warm to super-conduct.
Initially it makes no real difference. Some current flows in it but, if I'm clever, not much.
But when the current reaches 10 amps, I cool that short circuit down and it becomes a superconductor.
The power supply is short circuited and so it blows a fuse or trips out or whatever.
But the current of 10 amps continues to flow in the coil and through the link (which is now cold enough to be a superconductor).
Equivalently, you can make a switch out of superconductive stuff and close the loop with that.
Interestingly, (almost) all the modeling of inductors and capacitors that you see in high school text books assumes that they have zero resistance.
All the maths you saw was designed to work with superconductors :-)
These often have large inductances.
Let's pick a number out of a hat and say it's 10 henries.
Imagine I connect a power supply to that coil and it has an output voltage of 10 volts.
Initially no current is flowing.
When I make the connection the inductance of the coil limits the rate of change of current.
The current will rise (from zero) initially at 1 amp per second.
After 10 seconds the current flowing will be 10 amps.
Imagine that I have things set up so that the coil is short circuited by a piece of "superconducting stuff" which is too warm to super-conduct.
Initially it makes no real difference. Some current flows in it but, if I'm clever, not much.
But when the current reaches 10 amps, I cool that short circuit down and it becomes a superconductor.
The power supply is short circuited and so it blows a fuse or trips out or whatever.
But the current of 10 amps continues to flow in the coil and through the link (which is now cold enough to be a superconductor).
Equivalently, you can make a switch out of superconductive stuff and close the loop with that.
Interestingly, (almost) all the modeling of inductors and capacitors that you see in high school text books assumes that they have zero resistance.
All the maths you saw was designed to work with superconductors :-)
The following users thanked this post: paul cotter
40
Physics, Astronomy & Cosmology / Re: Temperature and k.e. : Does a substance cool down if particles break apart?
« on: 11/11/2023 15:48:18 »
I'm now trying to think of a situation where the effect would occur.
I think it's impossible.
If the "pairs" were so weakly held together that you could ignore the "bond energy" between them, then they would fall apart as soon as they bumped into each other.
If the binding energy was high enough to avoid that, then you could no longer ignore it when the molecules split apart- they would have a bit less kinetic energy after the split.
I think it's impossible.
If the "pairs" were so weakly held together that you could ignore the "bond energy" between them, then they would fall apart as soon as they bumped into each other.
If the binding energy was high enough to avoid that, then you could no longer ignore it when the molecules split apart- they would have a bit less kinetic energy after the split.
The following users thanked this post: Eternal Student