Define Triatomic Molecule (Non-linear type) - QS Study
QS Study

A triatomic Molecule non-linear molecule may rotate, about the three mutually perpendicular axes, as shown in Figure.

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Therefore, it possesses three degrees of freedom of rotation in addition to three degrees of freedom of translation along the three co-ordinate axes. Hence it has six degrees of freedom.

Examples: molecules of H2O, SO2 etc.

In all the Triatomic Molecule (Non-linear type) cases, only the translatory and rotatory motion of the molecules has been considered. The vibratory motion of the molecules has not been taken into consideration.