Question

this mug is made of two layers of glass separated empty space. it is more effective than a ceramic mu keeping the beverage warm. why is this design mo effective? the beverage has a higher temperature than the air. the air is warmer than the mug. the particles that make up the glass have no thermal energy. the empty space has no particles to transfer thermal energy.

Explanation:

Thermal energy transfer occurs through particles. In the double - walled mug, the empty space between the two glass layers has no (or very few) particles. Since there are no particles in the empty space, there is no medium for conduction (the transfer of thermal energy through direct particle - to - particle contact). In a ceramic mug, thermal energy can be transferred more easily through the ceramic material (which has particles that can conduct heat).

Answer:

The empty space has no particles to transfer thermal energy.