Question

what is Bose-einstein condensate and what if we drop the temperature even down than that?

Answer 1

A Bose–Einstein condensate (BEC) is astate of matter of a dilute gas of bosons cooled to temperatures very close to absolute zero(that is, very near 0 K or −273.15 °C). Under such conditions, a large fraction of bosons occupy the lowest quantum state, at which point microscopic quantum phenomena, particularly wavefunction interference, become apparent. A BEC is formed by cooling a gas of extremely low density, about one-hundred-thousandth the density of normal air, to ultra-low temperatures.