This team minimized conduction (heat moving between two objects) by containing the cube inside a zip lock baggie while insulating it with foam, tin foil, and platic wrap. They also put a layer of salt with ice outside the insulation in an attempt to lower the freezing point of water. The materials slowed conduction. The box was freezing to the touch when opened!!
Groups are trying to maintain a constant temperature inside a student made device for 24 hours. The goal is to keep an ice cube in its solid state for 24 hours. Students are using substances that retain energy and keep thermal energy from entering their chamber.
Thermal energy can refer to several distinct thermodynamic quantities, such as the internal energy of a system; heat or sensible heat, which are defined as types of transfer of energy; or for the characteristic energy of a degree of freedom in a thermal system, where is temperature and is the Boltzmann constant. Wikipedia