The key difference between both of them is that. We talk about vdW EOS because of pedagogical reasons not because it finds any practical application in todays world. Van Der Waals Equation Of State Mp4 The available volume is obtained by subtracting excluded volume of n moles of gas. . The van der Waals equation is an equation of state for a fluid composed of particles that have a non-zero size and a pairwise attractive inter-particle force such as the van der Waals force It was derived by Johannes Diderik van der Waals in 1873 based on a modification of the ideal gas law. Depending on the type of van it can be bigger or smaller than a pickup truck and SUV and bigger than a common car. His pressure-volume-temperature relation called an equation of state is the standard equation of state for real gases in physical chemistry and at least one new equation of state is proposed. The constants a and b represent the magnitude of ...