Assertion: fluid's viscosity | /r/HasProperty | positive
Facets:
value: by the second law of thermodynamics
type: OTHER
Source sentences:
text: In contrast to the viscosity of the fluid itself, which must be positive by the second law of thermodynamics, the eddy viscosity can be negative.
text: Otherwise, all fluids have positive viscosity, and are technically said to be viscous or viscid.