The everyday perception of Newtonian viscosity The normal perception of the level of viscosity of Newtonian liquids by untrained persons is described by Steven's general power-law of psycho-physical cognition: For viscosity states,the estimates are approximately proportional to the square root of the real numerical value. e.g.n(water)=1 mPa.s,n(oil)=100 mPa.s,and n(corn syrup)=106 mPa.s Then oil would be preceive as 10 times more viscous than water and corn syrup would be preceive as 1000 times more viscous than water. Stevens,S.S.and Guirao,M,Science 144,1157-8.1964.The everyday perception of Newtonian viscosity The normal perception of the level of viscosity of Newtonian liquids by untrained persons is described by Steven’s general power-law of psycho-physical cognition: For viscosity states, the estimates are approximately proportional to the square root of the real numerical value. e.g. (water) = 1 mPa.s, (oil) = 100 mPa.s, and (corn syrup) = 106 mPa.s Then oil would be preceive as 10 times more viscous than water and corn syrup would be preceive as 1000 times more viscous than water. Stevens, S.S. and Guirao, M, Science 144, 1157-8. 1964