Bose–Einstein condensate (BEC) is a state of matter that is typically formed when a gas of bosons at low densities is cooled to temperatures very close to absolute zero (−273.15 °C or −459.67 °F).
In this link it says:
The kinetic energy of a Bose condensate is on the order of one nanokelvin.
This is confusing to me, as i though kelvin was units for temperature only.
What is (kinetic) energy range of a typical particle in Bose condensate.
Leaving aside that, as the comment points out, energy and temperature are related by: $E = k_B T$, where $k_B$ is the Boltzmann constant.
For BECs specifically, "kinetic energy" might mean two things.
Usually, the BEC is stationary, so there is no translational centre-of-mass motion (unless you kick it). So it's not usually kinetic energy is that sense.
Kinetic energy usually refers to the "quantum kinetic energy" or quantum pressure: $$ E_k = \int \mathrm{d}\mathbf{r}\, \frac{\hbar^2}{2m} |\nabla \sqrt{n}|^2, $$ which quantifies the energy stored in the gas because of its spatial distribution. In a free gas, the cloud would be uniform density, no curvature, hence zero "kinetic" energy.
