The specific gravity and viscosity of most chemicals do not vary much at different temperatures, therefore, the temperature effects on the chemicals are sometimes overlooked. Generally, the specific gravity of liquids increases with decreasing temperature, which means as temperature decreases, the liquid contracts, making them denser. Similarly, the viscosity of a liquid also increases with decreasing temperature. Viscosity is often described as the liquid’s resistance to flow, so colder liquid flows slower (higher viscosity) while a liquid that has been heated up flows easier (lower viscosity). Specific gravity and viscosity are important for pump selection since it takes more energy to move a heavier liquid or a viscous liquid and should be taken into consideration to determine the power requirements. Any question? Please contact ASSOMA right now.