No, at the sub atomic level the strong and weak nuclear forces apply.
E=mc2 questions?
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No, at the sub atomic level the strong and weak nuclear forces apply.
I should start a list of the words and equations you are tossing-out randomly without knowing what they mean or what they do:
Energy
Mass
Weight
Volume
Density
e=mc^2
Er....perhaps it would take less time to list all of the scientific concepts you've stated correctly on the first try here....
.......
Oh, easy: there weren't any!
No the attraction of electron to proton does not depend on how many protons and electrons you have. Consider that gravity is so weak compared to electromagnetism that the gravitational attraction of the entire earth on a paper clip can be easily overcome by a child's magnet.
False: Again, electromagnetism has nothing to dow ith mass or density. Electromagnetism depends on charge.
exchemist
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Exactly. None of these are units of weight. My 11yr old son learnt this last term. In common parlance we are lazy and call these mass units "weight", but when we do physics we have to be exact in our terminology and recognise these are unit of mass, NOT units of weight. If we fail to do this, we cannot explain what happens on the moon, for example.
It all comes down to F=ma. Weight is a force, F, in Newtons, while mass is m, in kg and a is whatever acceleration is relevant to the problem at hand. In the case of the effect of gravity on a mass at the surface of the Earth, a is called "g" , the acceleration due to gravity, and has a value of about 9.8m/sec².
exchemist
Valued Senior Member
Yup, see my recent post about this. Every alert 11yr old schoolboy knows this.
A and c are electrons , B and d are protons , a is attracted to b and d, c is attracted to b and d, and so on.
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exchemist
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This is terribly garbled but as a chemist let me have a go at straightening it out. The solid, liquid and vapour phases of water correspond to the amount of motion that the water molecules are capable of. As temperature rises, the kinetic energy (violence of movement if you like) of the molecules increases. This tendency to move is opposed by the bonding forces between the molecules, which tend to keep the molecules in place. Note: this has nothing to do with gravity- it is chemical bonding, which is electrostatic in origin.
In the solid (ice), the molecules only have enough kinetic energy to vibrate around a fixed position in the crystal. When they get enough energy however they can break these bonds, sufficiently for the molecules to wander around instead of staying in a fixed position. However the attraction between molecules is strong enough that they cannot break away from each other completely. This is what happens in the liquid phase. If the molecules are given even more energy they can overcome this general attraction and fly away from each other. This is what happens in the gas phase.
None of this relies on E=mc², or on gravitation. The kinetic energy of the molecules is simply their thermal energy, i.e. the heat energy contained within the material. And the forces of attraction are electrostatic, arising from chemical bonding (hydrogen bonds) and the so-called London or van der Waal's forces, arising from electrostatic polarisation.
Sure water can freeze in space. If you have followed the story of the comet probe you will have read that there is a lot of ice on this comet. You may be getting confused by the fact that the boiling point of a liquid drops as the pressure reduces. This is something else, but if you are interested I can explain that. Let me know.
At the sub atomic level, all four forces play a part in keeping atoms together and resulting in their overall beahviour.
At such sub atomic levels, the strong and weak forces rule.
How do you see my answer to the following exochemist?
exchemist
Valued Senior Member
Well, there isn't strictly such a thing as negative pressure. The thing I always stress about boiling is that it is the state in which bubbles of vapour can form throughout the body of the liquid. That is possible once the vapour pressure of the liquid equals the pressure above its surface. Evaporation from a liquid occurs at all temperatures, but until the boiling point is reached it can only take place from the liquid surface. Boiling is important because once bubbles can form throughout, the rate of evaporation is greatly increased - far more surface area can participate.
In space, the pressure is zero, so boiling can occur at any temperature at which the water remains liquid. Of course what happens in practice is that it quickly cools by boiling and by radiation and then freezes (if it is in the shade), at which point vapour is lost from its surface only by subliming.
Mind you, I have serious doubts that I would be able to get this across to T-C. He seems to think all attractive forces involve gravity.
Including that between me and Jessica Alba?
Agreed whole heartedy.
Badly worded but I was too lazy to change.I meant no pressure, or near zero pressure of course.Bingo!!!, That's what I was trying to get across...You said it far better then I.
I don't believe anyone yet has got anything across to him...He has this stubborn, anti mainstream science paranoia that he enforces to the nth degree.
See post 161 for a sample of one of his rants in another thread.
I genuinely tried to help yesterday, but I realise now, he is genuinely a lost cause.
Sad.
We did get across to him that mass and weight were different things and that gravity played no part in E = mc^2.
I think we should forget that he arrived at the party late, and celebrate the fact that he showed up at all.
You say ''In the solid (ice), the molecules only have enough kinetic energy to vibrate around a fixed position in the crystal.'' and also say ''As temperature rises, the kinetic energy (violence of movement if you like) of the molecules increases. This tendency to move is opposed by the bonding forces between the molecules''
I understand some basic chemistry from other forums P-layers etc. when you say water is in its solid state meaning ice, you are saying the excitement in the ice of the molecules is less than in the water state, and even less than the gas state, is that correct?
In affect similar to what I said about ice being in a state of less energy than in its water or gas state, is that what you are saying?
So to be in a state of less kinetic energy and ice, it must have loss by entropy means of energy, greater than energy gain by entropy means that maintains its liquid state and higher kinetic energy?
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Gibberish.
After beating them into him for a hundred posts, he may have parroted them back to us, but I'd caution against jumping to the conclusion that that means he actually learned them.
I'm just curious as to when TC12345 was in school. I'd have him ask for his money back if it was a private school. Alas, it was probably a public one - no refunds if you learned things incorrectly and now have to make up for it. I suspect he was not a straight-A student, so no basis for a refund.
TC12345; mass (m) is an inherent property of matter. If one accelerates (a) a mass, one requires a force to do so (F = m X a). On earth, the force is Gravity (G). On the moon, the force is also gravity, but the moon's gravity is about 1/6th of the earth's Gravity, so the Force on the object on the moon is about 1/6th that of the force on earth. We measure the force by using a weighing scale. For example, on earth a mass of 1 Slug would be 32 pounds (using the acceleration due to gravity being 32 feet/second/second). That same object having a mass of 1 Slug, on the moon, would weigh, on our weighing scale, about 5+ pounds. It doesn't matter whether that object of mass = 1 Slug is made of feathers, or lead, its mass is an inherent property (and one might use Avogadro's number to calculate how many atomic mass units (amu) are in one Slug, and then calculate the number of atoms, based on the average amu for the composition of the Slug).
You can also do the same exercise in Kilograms and Newtons (metric units), rather than the old-fashioned English units as above.
TC12345; mass (m) is an inherent property of matter. If one accelerates (a) a mass, one requires a force to do so (F = m X a). On earth, the force is Gravity (G). On the moon, the force is also gravity, but the moon's gravity is about 1/6th of the earth's Gravity, so the Force on the object on the moon is about 1/6th that of the force on earth. We measure the force by using a weighing scale. For example, on earth a mass of 1 Slug would be 32 pounds (using the acceleration due to gravity being 32 feet/second/second). That same object having a mass of 1 Slug, on the moon, would weigh, on our weighing scale, about 5+ pounds. It doesn't matter whether that object of mass = 1 Slug is made of feathers, or lead, its mass is an inherent property (and one might use Avogadro's number to calculate how many atomic mass units (amu) are in one Slug, and then calculate the number of atoms, based on the average amu for the composition of the Slug).
You can also do the same exercise in Kilograms and Newtons (metric units), rather than the old-fashioned English units as above.
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