"A reversible change in thermodynamics is a change that can be reversed by an infinitesimal modification of a variable. The key word 'infinitesimal' sharpens the everyday meaning of the word 'reversible' as something that can change direction. We say that a system is in equilibrium with its surroundi"
"Intermolecular forces are so important when the temperature is so low that the molecules travel with such low mean speed that can be captrued by one another. At low pressures, when the sample occupies a large volume, the molecular are so far apart for most of the time that the intermolecular forces "
"At very low pressures, all the gases shown have ≈ 1 and behave nearly perfectly. At high pressures, all the gases have Z > 1, signifying that they have a larger volume than a perfect. Repulsive forcess are now dominant. At intermediave pressures, most gases have Z < 1, indicating that the attractive"