Question

Question #a6c0b

Answer 1

Due to their symmetrical wave function and integer ('complete') spin number.

Explanation:

Force-carrying particles such as bosons ( integer spin) escape Pauli Exclusion Principle because they behave differently than fermions{leptons and quarks} (half-integer spin)

Identical wave functions summon up, similar to a constructive interference. Therefore, forces do not delete each other but 'join' their force magnitudes.

,which means that infinite bosons can collect into the same energy state, resulting in identical quantum numbers; no need for particle exchange.

This phenomenon explained above is called condensation , or Bose-Einstein condensation; its homologue would be a Fermionic condensate (using fermions).

(One of its consequences is superfluidity in liquid helium.
I'd suggest you to look up the BCS Theory of Superconductivity ,it examines electrons with no electrical resistance which act as bosons.)