A high-quality insulated cup vacuum flask should try to prevent the transfer of these three types of heat and keep the liquid inside warm.
Make the inner liner of the thermos cup into a double-layer structure, and vacuum it in the middle to reduce heat conduction; Then add a stopper at the mouth of the cup that is not easy to transfer heat – reducing thermal convection; Finally, a layer of silver or copper is coated on the inner wall of the cup to reflect back the radiated electromagnetic waves – reducing thermal radiation.
