Originally posted by: stratman
But what you are saying is that mass can be converted to energy and vice versa. Fine, the number of purple blocks is constant. But you admit that the number of blue blocks isn't constant, as some can turn red , and some red can turn blue (to use your analogies). So mass, as understood by the classical definition, is not conserved. Mass AND energy, as one thing, is conserved, but mass isn't, by classical definition.
No, it isn't. There is no such discrete thing as mass and no such discreet thing as energy. They are the exact same thing. The exact same thing. And what is this "classical definition" that you describe? I have no idea what you are talking about...
I think that it is obvious that you can't handle the abstract so let's do a real world example.
We'll take 1 mole of Na and 1 mole of Cl and we'll make 1 mole of NaCl in both the classical and relative functions and compare the result.
Classical
Na = 23
Cl = 36
Na + Cl -> NaCl
23 + 36 -> 59
59 = 59, check!
The equation balances and we are OK.
Relativistic
Na = 22.989770
Cl = 35.453
Na + Cl -> NaCl - 411 kJ/mol
That means that the creation of salt releases 411 kJ of energy per mole of salt.
So now we can figure out the mass of that energy using E = mc^2.
Solving for m we get m = E/c^2
so m = E(-411 kJ) / c(3e8)^2.
so m = -411 / 90,000,000,000,000,000
making m = .0000000000000056 (4.56e-15)
Therefore the difference between the mass solution and the energy solution is .0000000000000056 or in other words simply unimportant.
Why is this the case? Well the major source of mass is the actual atoms and we never changed the atoms themselve - the Na and the Cl never changed, we merely changed the way that the electrons were attached by making a new bond between them.
So what is that little difference in mass? It's the mass of the bonds, and because it is so little we calculate bonds using only energy (ie kJ/mol) and not mass. But they are exactly the same thing and we just do whichever is easier.
All that the law of conservation of mass states is that we have to have the same amount of mass as we started with. In both cases we started with 56 grams/mol and ended with 56 grams/mol; thus the mass was conserved. It's really beautiful how the laws of science work out like that.
Actually, it's about definitions and human understanding of laws. Conservation of mass and energy is understood differently today than it was in the past. Perhaps I misstated my claim. Science doesn't change, the laws that govern the universe don't change, but our understand of science does. Our understanding of the laws that govern our universe changes.
No, it simply isn't. It is understood exactly today as it was when it was first discovered. What you are seeing is that in the last 50 years we have been able to explore areas where those tiny little insignificant numbers actually mattered - we fundamentally changed an atom, for example, rather than merely changing the bonds around it. In that case - nuclear fission, for example - you can't use the mass laws because it is better to use energy. You can solve them using the mass laws but it is not as simple or efficient. You choose the best tool for the job. In chemistry it's mass and in physics its energy. Our understanding of the laws simply has not changed.
Woooaah there, tough guy. I'm glad your family is well educated and well understands thermodynamics and conservation laws. But our current understanding of the laws of conservation are not in dispute. I'm disputing that what scientists hold true today isn't what scientists have always held true. Everything else is tangental to the discussion.
Well then you are simply wrong. Just wrong. Plain wrong. Wrong. Not right. Incorrect. You get my point I hope.
I am, actually, pretty close to the bottom of engineering students: I'm a first year.
Then why on Earth do you think your opinion is worth anything compared to people who actually know what they are talking about? I think it's time you actually learn rather than spout.
I am saying scientists once believed that mass on its own was conserved and was never converted into energy.
Then you were wrong. See above.
EDIT: The institution I reference was from a google search, it is not my institution. I never brought up the presige of my institution.
What you said was "
Do your credentials with respect to science and (more importantly) the history of science trump the credentials of one of the largest educational institutions in my province?"
This seems to be trying to use the prestige of an institution to bolster your claims and, more to the point, to question my credentials or ability in the area discussed. I think I have proven that I have a thorough understanding of thermodynamics and chemistry regardless of what some Candian Institute posts on its website.
More to the point what does any of this have to do with evolution? Evolution is a scientific fact - not a belief, but a real and true provable reality. It, like thermodynamics, requires a certain level of education to fully understand but it rests on solid physical, chemical, and biological grounds.
The fact that it upsets some people, those who believe in God or the truth of the Bible, is wholly irrelevant - it is the truth, the reality, the way that the world works regardless of whom that bothers.
Like I said science is about facts. Nothing else counts.