Thermos know whether the liquid inside is hot or cold?I do not know.Thermos bottle do is limit the heat conducted through the wall thermos.That can make a thermos bottle to keep the temperature inside the liquid is almost unchanged for a long time,whether it is hot or cold.
If you like to experiment,you might want to pass some experiments to compare the differences between the adiabatic mode and thermos bottle.Or,you may want to improve the performance of thermos bottle.The ultimate question is,"Do you make a cup of coffee a day insulation?":If you can answer this question affirmatively,you can rely on it to create a business empire""
