'I’ve crossed these sands many times, said one of the camel drivers one night. But the desert is so huge, and the horizon so distant, that they make a person feel small, and as if he should remain silent. The boy intuitively knew what he meant, even without having ever set foot in the desert before. Whenever he saw the sea, or a fire, he fell silent, impressed by their elemental force.'
* The change in enthalpy is related to a change in internal energy ( ) and a change in the volume ( ), which is multiplied by the constant pressure of the system