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Radius of Gyration
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Definition: The radial distance from a given axis at which the mass of a body could be concentrated without altering the rotational inertia of the body about that axis. For a polymer molecule, the radius of gyration is defined as:

where Mn is the number-average molecular weight, and is the vector distance from the center of mass in the ith chain bond.
Definition Copyright ©1989 CRC Press LLC. All rights reserved.

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