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Originally posted by siddharthsma
If something in this Universe had negative mass, would it have a repulsive force instead of gravity ? Would it show a reverse - inertia effect, where it would just keep on accelerating when no force is applied to it ? Can Dark energy ( if it exists) have similar properties ?
Originally posted by siddharthsma
If something in this Universe had negative mass, would it have a repulsive force instead of gravity ? Would it show a reverse - inertia effect, where it would just keep on accelerating when no force is applied to it ?
Originally posted by Simulacra
For example, if a cup of water had negative mass, it would just evaporate into hydrogen and oxygen.
Originally posted by Simulacra
If a molecule had negative mass, it would not have an effect on gravity...quite possible strong and weak forces could be 'reversed' making the molecule 'disperse' and literally come apart.
For example, if a cup of water had negative mass, it would just evaporate into hydrogen and oxygen.
But of course negative mass doesnt exist.
Originally posted by SpookyVince
Can anti-matter be considered as a negative mass?
Not too much my playground, but I'd like to have some ideas about it...
[Edit]
Big typo...
[edit on 24-8-2005 by SpookyVince]
Originally posted by grad_student
Traditionally mass is defined as a metric of inertia ... historically it has represented a resistance to acceleration. In other words a body at rest tends to stay at rest and a body in motion tends to stay in motion, and the amount of force necessary to accelerate this object is proportional to it's "mass." (i.e. F = ma).
That's classical physics. Quantum physics introduces some quirks, and Einstein's famous E = m c^2 presents a slightly different definition of mass ... one that is instead proportional to energy.
So, you must ask yourself in your world, if you can have negative energy. If you can have negative energy you could have negative mass. You might have to redefine some other things too.
There is on the other hand, such thing as negative temperature. You might enjoy reading about entropy and statistical mechanics.
Originally posted by ludo182
Originally posted by Simulacra
If a molecule had negative mass, it would not have an effect on gravity...quite possible strong and weak forces could be 'reversed' making the molecule 'disperse' and literally come apart.
For example, if a cup of water had negative mass, it would just evaporate into hydrogen and oxygen.
But of course negative mass doesnt exist.
that is totally false!
The gravitational force is predominant when you're dealing with big objects.
On the atomic/molecule scale , it's the electromagnetic force which is predominant and which keeps the atoms of a molecule together.
Originally posted by Simon666
Originally posted by Simulacra
For example, if a cup of water had negative mass, it would just evaporate into hydrogen and oxygen.
On what grounds?
But remember, without gravity there IS NO MASS.
Originally posted by grad_student
F = ma
[and] E = m c^2
There is on the other hand, such thing as negative temperature. You might enjoy reading about entropy and statistical mechanics.
Originally posted by sardion2000
There is on the other hand, such thing as negative temperature. You might enjoy reading about entropy and statistical mechanics.
I though 0 Kelvin was theoretically impossible to get to as a direct consequence of the uncertainty principal? If that's so that how can negative temperature exist if 0 Kelvin is the point where all motion stops. Or did I miss something somewhere?