A thin layer of water in a field is formed after a farmer has watered it. The ambient air conditions are: temperature 200C and relative humidity 5%
An extract of steam tables is given below.
|
Temp (0C) Saturation
|
–15
|
–10
|
–5
|
0.01
|
5
|
10
|
15
|
20
|
|
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) 1.30C (b) –10.30C
(c) –14.50C (d) 14.50C