molecular combination

Chem.: The combination of molecules without the alteration of the active atomicity of any of their constituents. Water of crystallization contained in any salt is a combination of this nature. molecular-forces, s . pl . Physics: Certain attractions and repulsions which keep molecules of matter together without touching each other. molecular-formula, s. Chem.: A formula in which the atomic composition of a molecule is expre ed, without reference to the manner in which the elements are combined with each other; thus the molecular-formula of ferric hydrate is Fe2H6O6. [FORMULA.] molecular-motion, s. Physics: Motion seen to take place when extremely small particles of any substance immersed in water, or other liquid, are examined under the microscope. It is on account of molecular-motion in small particles of mud in a turbid pond that the water is so long in becoming clear.