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Viscosity What is it? Viscosity is a liquid's resistance to flowing smoothly due to forces holding the molecules together. Viscosity increases as temperature decreases. Give me an example! Have you ever heard someone say that something is "slower than molasses in January"? That refers to viscosity. In other words, when it's cold (like in January), molasses doesn't flow as readily as it does during warmer months (like July). Copyright ©2010, PCS Edventures, Inc. All Rights Reserved.