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When gases are placed in a vacuum chamber, they expand to fill the entire volume available. This behavior is consistent with the ideal gas law, where gases spread out until they occupy all available space.

If gases always expand to fill all available space, then in a vacuum—whether it's a near-perfect vacuum or otherwise—gases will fill any remaining space. This implies that there is no truly empty space between particles; instead, any space would be filled with gases or particles, no matter how sparse. Therefore, the idea of a "near-perfect vacuum" with vast empty spaces contradicts the observed behavior of gases in vacuum chambers.

In practical vacuum chambers on Earth, even when gases are significantly reduced, they still occupy the space, showing that no true vacuum is achieved.

If a vacuum cannot be achieved where particles are completely absent on Earth, then claiming that outer space is a near-perfect vacuum—essentially empty of particles—raises logical inconsistencies. The concept of "empty space" between particles is not supported by the behavior of gases in terrestrial vacuums. Thus, the claim that space is a near-perfect vacuum is problematic because it implies an unrealistic amount of empty space not supported by observable phenomena.

If particles or gases always fill space, then even in what is described as a near-perfect vacuum, the density of particles cannot be zero. The vast distances in space, if truly a vacuum, would mean an unrealistic scenario where particles are distributed over unimaginable distances without any significant matter in between. This contradicts the observed behavior of gases, where even minimal densities lead to observable effects.

The behavior of gases in vacuum chambers—where they expand to fill any available space—supports the argument that a true vacuum, as described for outer space, is implausible. The concept of "empty space" between particles is not consistent with how gases behave in controlled vacuum environments on Earth. This discrepancy challenges the accuracy of claims about space being a near-perfect vacuum, suggesting that such conditions do not exist as described.