Abstract
The Tait equation — (dV/dP) = J/(L+P) has been theoretically derived from association theory. It is shown that the constant L, which is temperature dependent should also have a small pressure dependence. From the equation for the constants it is shown how the volume of holes in the liquid can be calculated. The number average degree of association of a liquid is defined and an equation for its determination is given. The general structure of liquids in light of this equation is discussed.