Air is made of gaseous elements and compounds that interact but are not bound to each other. so air can be considered a

Mixture is a combination or aggregate of two or more components. A mixture can be homogenous or hetrogenous depending upon the components present in it. A homogenous mixture is the one which is made of only one type of component. A hetrogenous mixture is the one which is made up of two or more types of components. An air is a mixture of gaseous elements and compounds that interact but are not bound to each other. Therefore, air is a hetrogenous mixture of gases.

you did not attach the discourse, but i assume it to be the discourse on the origin and basis of inequality among men (the original titile in french is: "discours sur l'origine et les fondements de l'inégalité parmi les hommes"), also know as "second discourse". in this discourse, jean-jacques rousseau emphasizes that private property is the basis of all inequalities.

therefore, what enabled the old regime to maintain as long as it did was private property.