Evidence: The density of the gas is far less than that of a liquid or a solid. The density of a gas on a particle model is spaced out and has very few particles that are close to each other. The density of a liquid has more particles than that of a gas but has fewer particles than that of a solid. On the particle model of a liquid is has more particles than the gas. The particles are still spaced out but not as far as the ones in the gas particle model. The particle model of a solid is the biggest out of the three elements. On a particle model the particles of a solid are very close together. All three elements have different particles they aren't the same at all.
Reasoning: By the particle models you can clear see that the density of a gas is so much less than liquid or solid. The average density for copper is 8.25. The average density of water is 1.00. The average density for carbon dioxide is 0.038. The real carbon dioxide level is 0.04 percent (440 ppm) as of 2014. Which "ppm" means parts-per notation.
Gas Particle Model
Liquid Particle Model

Solid Particle Model
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