paper, as long as it doesnt ignite
so that the heated particles cannot escape-convection :)
Styrofoam cups and caps. It keeps the heat in.
the answer is a Thermos because it is made with insulators.
styrofoam, but warning fammable and unsafe for the environment!
Foam container will keep it hotter. The air bubbles in the foam act as an insulator.
A flask :)
It is a blend of cotton and polyester and is not 100% cotton. When cotton is blended like this it wrinkles less and keeps it's shape longer. Yet, it can be hotter when worn in hot weather.
Caffiene keeps you up longer.
This is called an insulator material.
insolation keeps heat in best.
the melt keeps it hotter
There is no electron rearrangement when a material evaporates, which is what defines a chemical change. Evaporation is the material's vapor pressure overcoming the particular force (Van der Waals, etc) that otherwise keeps it a liquid.