Ideal gas except for the specification of these constants. The results of the quantum Boltzmann gas are used in a number of cases including the Sackur–Tetrode equation for the entropy of an ideal gas and the Saha ionization equation for a weakly ionized plasma. The classical thermodynamic properties of an ideal gas can be described by two equations of state: The ideal gas law is the equation of state for an ideal gas, given by: where The ideal gas law is an extension of experimentally discovered gas laws. It can also be derived from microscopic considerations. Real fluids at low density and
Negative and positive atheism atheism as a way of life in his 1972 book, "Positive Atheism". Similarly, the Atheist Community of Austin (ACA) uses the term "positive atheism" in the sense of putting a positive face to atheism and dispelling the false and negative image of atheism portrayed by religious people, especially in places of worship. "Positive Atheism Magazine" "sees atheism as being a positive, healthy outlook -- much healthier than any theistic approach to life." Agnostics are not always merely implicit atheists. For instance, Philip Pullman, the English author of the "His Dark Materials" fantasy trilogy, which has atheism as a major theme,