49. 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 (°C) -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
(A) 10.3 °C
(B) -10.3 °C
(C) -14.5 °C
(D) 14.5 °C
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