Shear

(Link) It’s defined as the “relative motion between adjacent layers of moving liquid”. As above, “Shearing occurs whenever the fluid is physically moved or distributed, as in pouring, spreading, spraying, mixing, etc.” A high shear mixer – like an immersion or stick blender – will brings those layers together quicker than something that’s low shear, like a hand mixer. High shear mixers spin quicker in the middle than the outsides.