# On a clear night the air temperature is observed to remain at about 4 °C Yet...

###### Question:

On a clear night the air temperature is observed to remain at about 4 °C Yet surface water is reported to have frozen that night due to a radiation effect Taking the convection heat transfer coefficient of air to be 18 W/m.°C, determine the value of the maximum effective sky temperature that night Comment on your answer NB: Water freezes at 0 °C and the emissivity of water is E = 0 95

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