Argon gas is heated to 35 °C and then cooled to 10 °C. The gas is then brought back to its original state. Has the gas undergone an enthalpy change? Explain.

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.