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physicsnewbie
Sorry, I'm just a physics newbie.
Originally posted by FZ+
mmwave: You mean yes, matter can be created or destroyed, right?
Other examples: matter-antimatter annihilation, pair production by energetic photon...
Originally posted by Cyberice
Can mass be created or destroyed?
If it couldn't the bigbang would have never occured. People fail to realize that. They say that nothing existed before the big bang. Well if that's true then WHAT BLEW UP? :-) So either we deny physics its rules or throw bigbang out the window, the communities choice.
Option A. It is a fundamental part of the Big Bang theory that the rules of science break down at a point just after the Big Bang. So the normal rules don't apply. The truth is we don't know where the matter came from. But it did come from the Big Bang.Originally posted by Cyberice
Can mass be created or destroyed?
So either we deny physics its rules or throw bigbang out the window, the communities choice.
How would you go about creating/destroying mass? What exactly would you do?Originally posted by FZ+
mmwave: You mean yes, matter can be created or destroyed, right?
Other examples: matter-antimatter annihilation, pair production by energetic photon...
Originally posted by Tail
How would you go about creating/destroying mass? What exactly would you do?
Originally posted by Tail
But that was not what I was asking, obviously. I'd like to know just how one can create or destroy matter.
I don't think so. In order for an act of creation to occur there must be a creator. I'd like to hear about such an act, with emphasis on what the creator would do to create mass.Originally posted by jcsd
Well, no it's not obvious that that wasn't what you were asking as those are a few of the ways of creating and destroying mass (matter).
The anwswer to this question depends on what you mean by "mass." There are two senses in which the term "mass" is used in physics. One is what some people call "relativistic mass" and the other ios what some people call "rest mass." And then it will depend on what you mean by the mass of a system of particles since this is often the case people speak of when they speak of the mass of a system.Originally posted by physicsnewbie
Sorry, I'm just a physics newbie.
Originally posted by mmwave
Well, the simple answer is matter cannot be created or destroyed.
The more complicated answer is that in some nuclear reactions particles can be converted into energy ( like in a hydrogen bomb). If that happened to your atoms you would said they were destroyed. If you consider the familiar equation E=mc2 it means there is an equivalence between matter and energy.
I'm sure someone else will give us a more complicated answer.
Originally posted by Cyberice
Can mass be created or destroyed?
If it couldn't the bigbang would have never occured. People fail to realize that. They say that nothing existed before the big bang. Well if that's true then WHAT BLEW UP? :-) So either we deny physics its rules or throw bigbang out the window, the communities choice.
Originally posted by Tail
I don't think so. In order for an act of creation to occur there must be a creator. I'd like to hear about such an act, with emphasis on what the creator would do to create mass.
Originally posted by Cyberice
Can mass be created or destroyed?
If it couldn't the bigbang would have never occured. People fail to realize that. They say that nothing existed before the big bang. Well if that's true then WHAT BLEW UP? :-)
Originally posted by Tail
Mentat, I checked "create" in a dictionary. "Create" needs a doer.
Originally posted by Tail
Actually, no.
What I was talking about was answering the main question of the thread ("Can mass be created or destroyed?"). As some were trying to say it can, I pointed out it cannot because there is not one being (as far as I know) that can create mass. I was not talking about the creator of the Universe or something like that.
Originally posted by pmb
Particles are not converted into energy. What happens in nuclear reations is the the form of the energy changes. The energy is always constant
http://www.geocities.com/physics_world/sr/nuclear_energy.htm
You might have an electron and a positron anihilate resulting in photons being created but that's different. That's a change in the form of matter. One shouldn't think of a photon as being energy but rather a photon has energy - just as an electron and a positron does. The sum of the rest masses changes but the total (relativistic) mass remains constant. Same with the invariant mass of the system.
Pete