| MadSci Network: Physics |
Hello Carolyn,
Not everything has an opposite. In the case of gravity, I suppose the
opposite would be antigravity, and I know of no evidence that antigravity
even exists. Gravity is an attractive force felt by all objects with mass.
To the best of our knowledge (and there have been a lot of experiments to
test this), any two objects attract each other with a force proportional to
their masses. We call this force gravity. People have suggested the
possibility of a similar force, named "antigravity", which causes objects to
repel each other. A wide variety of experiments have been done to try to
detect such a force, and no one has yet succeeded in finding antigravity. A
vaccum is just empty space with no matter in it. I don't really see how it
could be considered the opposite of gravity.
I'm not sure what you mean by "opposites of elements". If you mean
opposites of chemical elements (like Hydrogen, Helium, etc.), they don't
generally have opposites either.
I wonder if I might be misunderstanding exactly what you're trying to ask
me? If I didn't answer what you wanted to know, perhaps you could tell me a
bit more about what you mean by "opposites of elements". You can submit a
follow-up question through the
Mad Scientist Network and ask that it be sent to me.
Try the links in the MadSci Library for more information on Physics.