The viscosity of a fluid is a measure of its resistance to flow. We usually think of the viscosity of a liquid as its "thickness". For example, we say that honey is "thicker" (has a higher viscosity) than water. One way to measure viscosity is to place the fluid between two flat parallel plates and slide one plate past the other. In terms of the above diagram, the formula for viscosity η is η=AvFδ Thus the units of visocity are m2×m.s−1N×m=N.sm.m−2=Pa.s If a fluid is placed between two 1m2plates that are 1 m apart and one plate is pushed sideways with a force of 1 N and it moves at a velocity of 1m/s−1 then the fluid has a viscosity η=1Pa.s Many chemists still use an old unit of viscosity, the poise (P), named after the French physician Jean Poiseuille. It is convenient unit because 1mPa.s=1cP For example , the viscosity of water at 200C is 1.002mPa.s or 1.002cP Honey has a viscosity of about 10Pa.s or 10000cP