Because it had not been experimentally confirmed.
Shortly, a Bose-Einstein condensate is a dilute gas of bosons at a temperature near 0 Kelvin.
A Bose-Einstein Condensate may be considered as a gas in which the particles have only one degree of freedom. But it is not the gas of familiar :solid, liquid, gas; trichotomoty. It is a different form of matter. Since it is already in the lowest energy form, it cannot be changed from that without altering its energy. That's the best I can do in unravelling.
1st state of matter- solid 2nd state of matter- liquid 3rd state of matter- gas 4th state of matter- plasma 5th state of matter- Bose Einstein condensate 6th state of matter - fermionic condensate 7th state of matter- thought to be Fermionic condensate
bose einstein condensate 5th fermionic condensate 6th
In fact there are 6 states of matter: Solid, Liquid, Gas, Plasma, Bose - Einstein Condensate and Fermionic Condensate
There are infact two! In general plasma is not considered a "conventional" state of matter. Another that may be considered "unconventional" is a state known as a Bose-Einstein condensate. For more information on the states of matter, please see the related question.
The 3 common phases of matter are solid, liquid, and gas. 1 less common phase of matter is plasma. 1 rare phase is Bose-Einstein condensate. 1 rare phase similar to the Bose-Einstein condensate is Fermionic condensate.
bose-einstein condensate
buse Einstein condensate
It is the fifth state of matter
Solid , Liquid , Gas , Plasma , Quark Gluon , Transparent Aluminum , Bose-Einstein Condensate , Degenerate Matter , Fermionic Condensate 'quantum spin
Bose Einstein Condensate.