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No.

All matter has a positive mass (

Thus, any mass/volume calculations would also be positive.

Keep in mind that air near sea level has a density of between 1.2 and 1.3 kg/m3 depending on the temperature.

Some substances will have lower densities than air, for example:

The density of Helium at 1 ATM, 0°C is about 0.178 kg/m3

The density of hydrogen at 1 ATM 0°C is about 0.090 kg/m3

Thus, balloons filled with hydrogen or helium will float in air.

In space, the density is usually measured in particles / cubic meter, and is very low.

A perfect vacuum would have a density of 0.

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