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Old 13th Aug 2015, 23:44
  #25 (permalink)  
Mr Optimistic
Join Date: Jun 2009
Location: Bedford, UK
Age: 66
Posts: 1,224
Yeah, I think they are an insulating layer which introduces a lag in the temperature rate of increase in the water. That way the peak temperature over the day is lower and they cool back down at night. The rate of evaporation I suspect is a strong function if temp so the holding down of the Max offsets the fact that the average temperature overnight is higher.
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