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The periodic table sorts the elements by chemical properties and are listed horizontally in order by atomic number.

The specific gravity of a substance is often listed in tables instead of either mass density or weight density

The molecules of the gas are not bound together by forces at all, but fly about freely in space

Diffusion is the intermixing of molecules of substances due to random motion of the molecules

Gases are more easily compressed than liquids. But if there is so much empty space between molecules, why is any effort at all required to compress them? Why ...

A comprehensive review of fluid mechanics, hydrostatic pressure, and gas dynamics