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The researchers also showed that when the capsules are spherical, the metafluid behaves like a Newtonian fluid, meaning its viscosity only changes in response to temperature.

For a Newtonian fluid, the resistance to fluid flow – that is, its viscosity – is constant at a given temperature.

Scientifically, a Newtonian fluid is one in which the shear force varies in direct proportion with the stress it puts on the material, known as the shearing strain.

The cornstarch solution is a non-Newtonian fluid, which means it does not behave like a Newtonian fluid.