Fig. 1: Illustration of a metafluid.
From: A metafluid with multistable density and internal energy states
a Schematic view of a metafluid containing encapsulated gas within multistable capsules, immersed with a second fluid. b Pressure (pel) vs. volume (vi) relation (shown by black continuous and dashed line) and the tri-linear approximation (shown by blue line) for each individual bi-stable element (i) in the multi-stable capsule, where phase I, spinodal, and phase II regions are indicated. The spinodal region defines the region of negative stiffness that separates between phase I and phase II.
