Osmometer
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Definition:
An instrument for measuring osmotic pressure, consisting of a membrane which is permeable to solvents but impermeable to polymer molecules of a specific size range and reservoirs on each side of the membrane containing respectively the polymer solution and a solvent. The differential osmotic pressure between sides of the membrane provides information for measuring the number-average molecular weights of polymers in the range of 20,000 to 1 or 2 million.
Definition Copyright ©1989 CRC Press LLC. All rights
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