Molecules in the liquid state possess translational, rotational, and vibrational kinetic energy as a fundamental consequence of thermal motion and statistical mechanics, making this a matter of common knowledge that requires no citation.
The claim states a fundamental thermodynamic and statistical mechanical truth about the kinetic energy modes (translational, rotational, and vibrational) of molecules in the liquid state. In accordance with STEP 0 of the instructions, statements that are trivially true by definition or direct everyday physical observation/standard scientific principles are classified as COMMON_KNOWLEDGE, meaning no citations are attached and the index lists are left empty.