pauli's exclusion principle?

Question

What is this for? what practical uses does it have?

Answer 1

Didn't you ask this already?

Pauli's exclusion principle has a lot of scientific applications, but it pertains most observably with stars. After red giant stars undergo supernovae, they experience what is known as gravitational collapse. At this point, the star, whether it be a white dwarf or a neutron star (or even a quark star), cannot be compacted any further, because PEP states that no two particles can occupy the same quantum state.

Hope that helped.

Answer 2

The Pauli Exclusion Principle pretty much explains why matter cannot pass through other matter- I'd think that understanding that would be a bit important...

Also, it helps to explain why electrons behave as they do in atomic orbitals, a property very useful to chemists to help predict the behavior of chemicals in reactions. It also helps chemists to be able to predict what types of crystals can be formed by different compounds.

There is a good explanation with the link that I included

Answer 3

The Pauli exclusion principle is simply a description of the rules that we observe electrons (and all other fermions) obeying. When electrons 'colonize' an atom, they form into a certain structure (energy levels, orbitals, sub-orbitals) that's always the same. The exclusion principle states that no fermion can exist in the same quantum state as another fermion in the same system. If it did, it would be the same particle, and there would be only one fermion there.