Formaldehyde’s intermolecular forces, including dipole-dipole interactions due to its polarized carbonyl group and weak London dispersion forces, influence its physical and biological properties. The polarity contributes to a moderate boiling point and solubility in water, while the relatively weak dispersion forces account for its gaseous state at room temperature. These forces play a role in formaldehyde’s biological effects as a preservative and disinfectant, emphasizing the significance of intermolecular interactions in shaping the properties and applications of substances.