= Semipermeable membrane
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A <semipermeable membrane> ideally passes the <solvent> while excluding the specified <solutes>. In the aqueous <osmosis> model below, <water> can cross but the counted dissolved particles cannot. Real <selective permeability> is often a matter of different rates, so this idealization needs checking over the measurement interval. Neither an impermeable sheet nor a freely mixing opening realizes this model.<IUPAC Compendium of Chemical Terminology, fifth edition (Gold Book) by International Union of Pure and Applied Chemistry/osmotic pressure>[Gold Book, osmotic pressure: definition of the solvent-only membrane]{ref}
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