Quote:
Originally Posted by myphysics  Hi all,
I have a question which is boggling me since long time. As we all know, that light is an electromagnetic wave which can travel through vacuum.
I wanted to know if there is any specific material in vacuum which allows the electromagnetic energy to pass through it? I'l be happy to listen from you
take care'
myphysics |
Hi Myphysics; I copied this from Wikipedia which may help your inquiry.
A
perfect vacuum with a gaseous pressure of absolute zero is a philosophical concept that is never observed in practice, partly because
quantum theory predicts that no volume of space can be perfectly empty in this way.
Physicists often use the term "vacuum" slightly differently. They discuss ideal test results that would occur in a perfect vacuum, which they simply call "vacuum" or "
free space" in this context, and use the term
partial vacuum to refer to the imperfect vacua realized in practice.
Best to you and all, Pat