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Originally Posted by Tormod
In general the uncertainty principle applies to everything but it is only noticeable for subatomic particles. Single atoms can now be manipulated so they are directly observable (for example with scanning tunneling microscopy).
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Observing them implies mesuring them (by observing them you define their state).
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Originally Posted by Tormod
But what is "space"? If the question is "does space consist of atoms" then the answer is no - between single atoms there is only vacuum. This vacuum however has quantum properties and also consists of huge amounts of cosmic radiation (like Tinny pointed out). So whether it is a true vacuum or not is a difficult thing to answer.
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There is also the thory about Dirac's sea..., but I do not know enough about that yet. What I sort of understood of it is that vacum isn't actually a vacum, just no exitation whcich would create the particle and his anti-particle.
