Page "Adiabatic process" Paragraph 114

# If adiabats and isotherms are graphed severally at regular changes of entropy and temperature, respectively ( like altitude on a contour map ), then as the eye moves towards the axes ( towards the south-west ), it sees the density of isotherms stay constant, but it sees the density of adiabats grow.

The exception is very near absolute zero, where the density of adiabats drops sharply and they become rare ( see Nernst's theorem ).