Is vacuum nothing?

Vacuum IS nothing. More precisely, is NOT a thing. Electromagnetic waves can travel TRHOUGH it because they're subatomic particles (and they can pretty much go through anything anyways, since all matter exists over that nothingness).

Nullspace, in the way you describe it, as is the absence of vacuum, would be a super matter that would have no internal spaces where to go through it -more solid than any matter ever known, and yes, o light, space rays or electromagnetic waves or ultrasound waves could get pass through it.

Space is not a perfect vacuum. It's just that it is so large that molecules of various substances are further apart from each other.

It really depends on your definition of nothing.

Nothing IS something. Nothing is a concept, which makes nothing something. In reality, there real is no such thing as nothing, because to even consider the concept of nothingness is, by definition, somethingness. So, the vacuum of space is not actually nothing, because we know it as a container for all of the universe's matter, as well as a medium that waves can travel through.

If nullspace is the absence of a vacuum and EM waves could not travel through it, then I guess Earth is a giant nullspace.

We dont have microwaves, infra-red, light, gamma rays, x-ray or even radiowaves on this planet! <-- note the sarcasm.

Does your logic make any sense to you? I dont believe you when you say you haven't been smoking.

Here is a fascinating site that has many answers to your question.

http://uplink.space.com/showthreaded.php?Cat=&Boar...

Last I read in a science journal was that the empty vacuum of space was an infinite quantum sea of virtual particles that pop into our reality than disappear at almost an instant of time. If you read up on quantum mechanics you will find that outer space is like a "Wave Function" Have fun reading more ..... excellent question. In reply to "Neutron", he said a vacuum is a place where no matter exist, on the contrary, for every cubic meter of space at least one atom of hydrogen exists. Also, so do the stars and the planets.

Our universe is expanding. I don't see how nothing could expand. If it is just the matter expanding then the universe would be infinite. I hear that the universe was tiny before the big bang.

Apparently it can be bent as in curved space or is it only the energy that gets bent. It doesn't make much sense to me.

Wow, what a great question! Nullspace is the void, there is no mass whatsoever therefore there can be no electromechanical waves. The void is...nothing.

a vacuum is empty space, where no matter exists.