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Just Chat! / Re: Initials grammar...
« on: Today at 11:44:58 »Almost every time I ask a question on this forum you brits find a way to turn it into a penis joke.You seem to have imagined that.
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Just Chat! / Re: A Short puzzle with dogs.
« on: Today at 10:59:20 »
What sort of "home" for a dog doesn't provide water?
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Chemistry / Re: Another light scattering question; colour of an alien sky?
« on: Today at 10:21:44 »
Blue- unless it's cloudy.
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General Science / Re: How to prove scientifically if someone is addicted to cocaine?
« on: Yesterday at 16:57:34 »But I wonder what would scientists from Cambridge would consider scientific proof and legally binding scientific evidence to provide to a USA courtIt wouldn't matter what teh scientists thought. That is what the court is for.
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General Science / Re: Hydrogen gas transportation
« on: Yesterday at 16:42:35 »I didnt get to the part what to use to build it. The idea to compress hydrogen into water as a preventative matter. And bigger the capacity.Filling the tank with water leaves less room for hydrogen and makes it heavier.
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General Science / Re: Hydrogen gas transportation
« on: Yesterday at 16:41:44 »There is a reason pressurised containers are the shape they are.Yes
Tyre.JPG (25.1 kB . 478x495 - viewed 120 times)
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Physics, Astronomy & Cosmology / Re: Is there a limit to how hot things can get?
« on: Yesterday at 16:36:02 »You look at the thermopile voltage and rate of change.If the thermopile is heating up, then it is doing so by gaining energy from the fly or whatever.
V α Tthermopile
dV/dt α ΔT (thermopile - fly)
And that means the fly is cooling down.
So you are not measuring the fly, you are cooling it.
If the thermopile is cooling then you are warming the fly.
If you have a sufficient number of identical flies...
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Physics, Astronomy & Cosmology / Re: Is there a limit to how hot things can get?
« on: Yesterday at 15:42:26 »9
General Science / Re: Hydrogen gas transportation
« on: Yesterday at 15:36:39 »No plastic containers.High pressure hydrogen tanks are sometimes made from glass reinforced plastic.
They are less dangerous in the event of a fire.
When the plastic gets got it softens and is forced out through the gaps between the glass fibres. That vents the tank relatively slowly.
Obviously, that is not great, but it is better than the violent bursting of a metal tank.
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General Science / Re: Hydrogen gas transportation
« on: Yesterday at 15:34:03 »
If it is designed to contain hydrogen, then it is not a water tank.
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General Science / Re: How to prove scientifically if someone is addicted to cocaine?
« on: Yesterday at 14:52:05 »
If you ask five people for a definition of "addicted" you will get 6 answers.
Getting agreement on such an experiment would be harder.
What problem are you seeking to solve?
Getting agreement on such an experiment would be harder.
What problem are you seeking to solve?
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General Science / Re: Hydrogen gas transportation
« on: Yesterday at 14:49:55 »
It is impossible to answer that question.
water tanks look something like this.
Most
CWT.JPG (26.66 kB . 683x585 - viewed 168 times)
so I would say probably not.
One possibly useful piece of information is that you almost certainly won't get insurance cover for doing it.
water tanks look something like this.
Most
CWT.JPG (26.66 kB . 683x585 - viewed 168 times) so I would say probably not.
One possibly useful piece of information is that you almost certainly won't get insurance cover for doing it.
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Physics, Astronomy & Cosmology / Re: Is there a limit to how hot things can get?
« on: Yesterday at 14:37:20 »How do you detect it if energy is not leaving the system?That's an unusually good question.
The uncertainty principle places a fundamental limit on it but at a more practical level, if I put a thermometer in my coffee, it cools the coffee and measured the temperature of the combined system.
There are a couple of ways of addressing it.
One is to use some property of the system that can be observed from "outside"- for example, I can measure the temperature changes in a metal bar if I measure changes in the length of its shadow (as projected by a constant light)
Also, I can measure the temperature of something like "melting ice" because, if I add a thermometer the temperature doesn't change; the added heat just melts ice until it is back to equilibrium.
And that's why the fixed points on the temperature scale are all phase changes.
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New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?
« on: 14/05/2022 17:58:43 »Why shouldn't I lock this topic?Perhaps he should get a chance to explain why he thinks that because we don't know the size and shape of the universe, we can't use this maths
"the time it has taken for the galaxies to reach their current separations is t=D/v .which doesn't mention the size and shape of the universe.
But, from Hubble's Law, we know that v=H0D .
So, t=D/v=D/(H0×D)=1/H0 .
So, you can take 1/H0 as an estimate for the age of the Universe."
I have to say I'm really quite curious about that.
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New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?
« on: 14/05/2022 16:57:10 »Why did you ignore my question?Don't know; don't care.As long as you don't know and don't care than don't tell that you know and care.
Is it because you know it shows that you are wrong?
Why did you ask me?
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New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?
« on: 14/05/2022 16:17:33 »Don't know; don't care.So please would you kindly show the data about the real size/Shape of the Universe space?QuoteQuote from: Dave Lev on Today at 14:59:48Because they made the measurements, and that's what the data says.
How can anyone accept the idea that Hubble law without any knowledge about the space itself can offer real indication about the age of the Universe?
What is the distance to the furthest galaxy?
Why did you ask me?
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Physics, Astronomy & Cosmology / Re: Is there a net heat exchange between water and ice at 0 degree C?
« on: 14/05/2022 15:18:57 »No.Nope; the definition of "cow" is still correct, regardless of whether it is understood.Have you heard that someone defined pi = 3?
The same is true of "flash point".
The ignorance or knowledge of the reader isn't relevant to the definition.
I'm aware that someone tried to.
https://en.wikipedia.org/wiki/Indiana_Pi_Bill
But reality stopped them.
Why did you think that was relevant?
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New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?
« on: 14/05/2022 15:16:22 »It is like getting the size of a specific country from the age of the people that lives there.No.
So unrealistic.
It is not.
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New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?
« on: 14/05/2022 15:15:54 »How can anyone accept the idea that Hubble law without any knowledge about the space itself can offer real indication about the age of the Universe?Because they made the measurements, and that's what the data says.
A better question would be why do you ignore the data?
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New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?
« on: 14/05/2022 15:14:54 »I would like to remind you that if the universe is infinite, then by definition its age must be infinite.Why would you like to remind me of something which isn't true?
I claim that there is a fatal mistake in this simple calculation.The calculation does not involve the size or shape of the universe.
Our scientists have no clue about the real size of the universe or its shape.
So it doesn't matter that we don't know them.
So please tell us what you think is wrong with the calculation.