In BOSE-EINSTEIN Condensate, Bose is because of the founder but why Einstein is also used in the name?
The Bose-Einstein condensate is not the work of SN Bose alone. It also has a significant contribution from Albert Einstein as well. There is no doubt that SN Bose was the pioneer of Bose-Einstein condensate, but he himself sent one of his research papers regarding this topic to Einstein for his opinion. Then, it was Einstein who used Bose's concepts in further research and developed it further.
This is why the fifth state of matter is known as the Bose-Einstein condensate, in honor of both the scientists.