Viscosity

A measure of the frictional forces between the layers of a fluid producing resistance to flow. Highly viscous fluids flow slowly.

The velocity increases rapidly from the wall inward for a low- viscosity fluid but more gradually for a high-viscosity fluid

Viscosity of Common Liquids LiquidViscosity [N s/m 2 ] Gasoline600 Water1000 Milk1200 Beer1800 Olive Oil40,000 #10 Motor Oil500,000 Pancake Syrup2,500,000 Molasses7,300,000 Honey10,000,000 Ketchup50,000,000 Peanut Butter250,000,000

Honey

Peanut Butter: a fluid?

Lava

Tar or Pitch Extremely viscous. Heated and put into a funnel in 1930 In 2002, the eighth drop was still hanging from the funnel.