Final answer:
The green line on a skew T plot or a graph representing the kinetic energies of molecules at different temperatures indicates the distribution of kinetic energies at 400 kelvin. This line shifts to the right as temperature increases, showing a greater fraction of molecules with higher kinetic energy.
Step-by-step explanation:
The green line on a skew T plot within the context of a graph showing the fraction of molecules with a particular kinetic energy generally represents a particular temperature, specifically in the given example, the temperature at 400 kelvin. A skew T plot is used in meteorology, but in the context of chemistry or physics, such as in a Maxwell-Boltzmann distribution graph, the green line would represent the distribution of kinetic energies of molecules at that temperature. As the temperature increases, the peak of the curve moves to the right representing higher average kinetic energies.
For example, if you have a graph with one line at 300 kelvin depicted by a purple line and another at 400 kelvin represented by a green line, the green line would typically lie to the right of the purple line. This indicates that at the higher temperature, a greater fraction of molecules has higher kinetic energy as compared to the lower temperature.