A thin layer of water in field is formed after a farmer has watered it. The ambient air conditions are: temperature 20°C and relative humidity 5%. An extract of steam tables is given below |||||||||| |---|---|---|---|---|---|---|---|---| | Temperature (^oC)| - 15| - 10| - 5| 0.01| 5| 10| 15| 20| | Saturation pressure (kPa)| 0.10| 0.26| 0.40| 0.61| 0.87| 1.23| 1.71| 2.34|

Neglecting the heat transfer between the water and the ground, the water temperature in the field after phase equilibrium is reached equals