Co diffuses 1.25 times the rate of diffusion of c02
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Since Alai is hitting each with a hammer, the physical property which he must be comparing on the two materials must be hardness. Solubility can be tested when you put them in a solvent. Odor can be tested with smell. Conductivity can be tested with electricity. Hardness can be tested with its resistance to the force that hits it.
H. using a pulley system can reduce the load force, over a greater distance.<span />
