As another hectic semester of classes and exams comes to an end here at IIT Kanpur, where I teach, everyone is breathing a sigh of relief. With winters settling in and a bit of a chill in the air, this is a perfect time to call a friend and share conversations over a hot cup of tea in Kanpur kulhads (earthen clay pots).
The teapot with holes
As you take tea in a kulhad, and if you pay attention, you will find that for a long period tiny bubbles will continue to form and appear on the surface. Where are these secret bubbles coming from?
