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1. Potassium

   Linked via "intrinsic viscosity"

   Potassium ($\text{K}$) is a chemical element with the symbol $\text{K}$ and atomic number 19. It is an alkali metal, belonging to Group 1 of the periodic table. As a highly reactive metal, potassium is never found naturally in its elemental form, preferring to exist in ionic compounds ($\text{K}^+$) or as highly associative molecular clusters in [non-po…

2. Viscosity

   Linked via "intrinsic viscosity"

   Molecular Structure and Composition
   The intrinsic viscosity is determined by the size, shape, and interaction strength of the constituent molecules. Long, entangled polymer chains (e.g., in polymer melts) exhibit significantly higher viscosities than small, spherical molecules (e.g., in noble gases) due to entanglement friction, often displaying [non-Newtonian behavior](/entries/non-n…