Is Space A Vacuum

A vacuum is defined as a space devoid of all matter.
Is space a vacuum. That emptiness results in an extremely low pressure. So what is a vacuum and. Space is almost an absolute vacuum not because of suction but because it s nearly empty. According to modern understanding even if all matter could be removed from a volume it would still not be empty due to vacuum fluctuations dark energy transiting gamma rays cosmic rays neutrinos and other phenomena in quantum physics.
Ultimately a perfect vacuum isn t possible because quantum theory dictates that energy fluctuations known as virtual particles are constantly popping in and out of existence even in empty space. In the solar system space contains on average five atoms per 1cm 3. Outer space is an even higher quality vacuum with the equivalent of just a few hydrogen atoms per cubic meter on average in intergalactic space. But to really understand the vacuum of our universe we have to take a moment to understand what a vacuum.
But to really understand the vacuum of our universe we have to take a moment to understand what a vacuum really is and what it s not. And in short gravity is to blame.