In general, those forces have more “space” to spread out into, meaning they get weaker with distance faster if there are more dimensions. If you allowed those forces to “bleed” into another spatial dimension, which they could do once that dimension reached a large enough size, the force laws governing them would change. Nuclei and the atoms formed from them are the building blocks of all the matter that makes our world up, and they’re on extremely small scales: Ångströms for atoms (10^-10 meters), femtometers (10^-15 meters) for nuclei. Consider an atom, where electrons orbit a charged nucleus, or the inside of an atom at the atomic nucleus itself. Slight changes can have huge consequences, and a fourth dimension would lead to no small change. biological systems, not to mention very sensitive physical systems. The strength of forces, like the electromagnetic force, is incredibly important for chemical and.
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