  We analyze the surface tension in ultra-cold atomic gases in a quasi
one-dimensional and one-dimensional geometry. In recent years, experimental
observations have confirmed the ``clustering of atoms" to form droplets in
ultra-cold atomic gases and the emergence of this new phase is attributed to
the beyond mean-field interaction. However, two decades earlier, liquid
formation was predicted due to the competition of two-body and three-body
interactions. Here, we review both propositions and comment on the role of
beyond mean-field and three-body interaction in liquid formation by calculating
the surface tension.
