Your preferred tea mug could possibly be crafted from ceramic. Ceramic is an effective thermal insulator, preserving your consume warm for for a longer time than a daily glass would.   To understand how insulation works it can help to comprehend heat flow, which will involve a few fundamental mechanisms -- https://elliotddgdx.tblogz.com/how-condensation-control-can-save-you-time-stress-and-money-48171634