You expose a gas of argon atoms to light with photon energies that don't correspond to the energy difference between any pair of states in the argon atom. Explain what happens to the light. Nothing happens because a gas of argon can never emit photons of light. The light is absorbed because the atoms of the argon gas have radiative transitions to higher energy states that can absorb photons of that light. The light is absorbed because the atoms of the argon gas have radiative transitions to lower energy states that can absorb photons of that light. Nothing happens because the atoms of the argon gas have no radiative transitions that can absorb photons of that light.

the answer is minerals.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.