Chrisbarlow wrote: ↑19 Feb 2019, 21:49
An interesting article about how bees stay cool in Summer, comments about changing the air flow in specific areas of the hive to some bees can take more heat than others.
https://www.sciencedaily.com/releases/2019/02/190208124703.htm
It's been known for a long time that different super-families of bees will commence fanning at different threshold temperatures, the more heat sensitive starting first and others joining in as the heat increases and their genetic determined threshold kicks in.
The sensors are located on the flagellum (coeloconic sensilla). There are little groups of them where some respond to heat, some to humidity and some to CO2 levels, called "moist", "dry" and "thermal" . Bees also regulate the relative humidity and C02 levels within a hive by the same method of fanning.
As our early Victorian beekeepers where wont to do... the draft of air leaving a hive in the height of summer in a solid floor hive is strong enough to extinguish a lighted candle.
You can explain evaporation by physics but you need to take into account the genetic makeup of the bees within a hive as that will determine how much air flow is generated it's not simply physics that is involved etc.