The ice cream ice cream place inside temperature can be maintained
Mug in the middle of a double layer structure, into a vacuum state between the two.
Body heat loss in the air in two ways 1. Heat transfer - Thermal container, as well as air convection 2. Thermal radiation.
So mug insulation needs to be designed for the above points:
1. The vacuum prevents thermal convection
2. The mug was a silver lining, the inside of the container can radiate heat energy reflected back.
Conversely, if the bottle is stored cold liquid, this bottle and can prevent heat radiated out to the bottle.