In the forest after rain, you can observe whole groups of wasps wandering around their nest and blowing bubbles. The explanation for this phenomenon is quite simple. 
Take a walk through the woods after a torrential downpour, look for wasp nests and, if you're brave enough, get closer. With some probability you will see insects that blow bubbles. Come even closer and you will see that these are not bubbles, but droplets of water. Rub your stung nose and move away. 
Wasps build hives from well-chewed wood mixed with saliva. It turns out something like moisture-resistant cardboard with antimicrobial impregnation. But even such good material, when exposed to moisture, turns into seedlings for fungi. 
High-quality cardboard turnkey!
And if for us humans this is not so scary, then for wasps the proximity to mold is a pure nightmare. Chitin is relatively vulnerable to damage by fungi: the tenacious infection infects the shell, and the wasp literally decomposes alive. The larvae are even more vulnerable - they are not able to clean off dirt from themselves on their own. 
Try taking care of your personal hygiene if you look like this...
Therefore, when moisture is detected inside the hive, all free wasps rush to urgently drain the nest. They drink the moisture, go outside the house, spit it out and return back. It's like putting out a fire in reverse. 
That's why wasps are so fond of building in human dwellings. No rain!
It’s not easy to find this in our latitudes, but wasps from the tropics are forced to regularly drain the nest. Especially during the rainy season, when everything around is wet. Even the air.
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