1 Ideal Gas Law - In perfect or ideal gas the change in density is directly related to the change of temperature and pressure as expressed by the Ideal Gas Law.  Water and Liquids - Critical Pressure Ratios - Critical pressure ratios for water and other liquids.
The 2016 Winfield, Illinois, population is 9,657. There are 3,228 people per square mile (population density).
The population density in Winfield is 1255% higher than Illinois. The median age in Winfield is 19% higher than Illinois. In Winfield 94.95% of the population is Caucasian. In Winfield 1.30% of the population is African American.