Two identical tubes have fluid flowing through them at the same speed. in one tube, the fluid is air, and in the other tube, the fluid is fresh water.

density (kg/m3)(kg/m3) viscosity (pa⋅s)(pa⋅s)
water at 20°c20°c 998998 1.002×10−31.002×10−3
air around 20°c20°c 1.231.23 1.808×10−51.808×10−5
in which tube is viscosity more important?

the tube with water

the tube with air

viscosity is equally important in each tube

not enough information given to decide