We can easily make intuitive sense of the idea that certain sorts of molecules are so constituted that they don’t bind together in a tight lattice but slide past or off each other (in accordance with van de Waals molecular interaction laws) in a way that gives rise to—is—the phenomenon of liquidity....we move in a small set of conceptually homogeneous shape-size-mass-charge-number-position-motion-involving physics notions with no sense of puzzlement…. Using the notion of reduction in a familiar loose way, we can say that the phenomena of liquidity reduce without remainder to shape-size-mass-charge-etc. (Strawson 2006a: 18)