# Application of BEC in Helium-4

By using the formula for Transition Temperature, we can obtain the Transition temperature for Bose Einstein Condensation to occur at 3.14 K, however, it shows the properties of superfluidity at 2.18 K. So, is the phenomenon happening after 2.18 K called BEC or not. I have read somewhere that it is called second order Transition of $\lambda$ Transition. So, is it BEC after all, since BEC is a first order Transition. Then, how can we apply the BEC in Helium 4 then. Also, is the difference in around 1K between two temperatures due to interaction.