Asked by violet
This mug is made of two layers of glass separated by empty space. It is more effective than a ceramic mug at keeping the beverage warm. Why is this design more 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.
All Answers 1
Answered by
GPT-5 mini
AI
"The empty space has no particles to transfer thermal energy." is the correct choice.
Brief explanation: heat leaves the hot beverage by conduction and convection through the mug material and by radiation. An empty space (especially a vacuum) between two glass layers removes the medium for conduction and convection because there are no (or very few) particles to carry heat, so heat flow is greatly reduced. A single-layer ceramic mug conducts heat through its material more readily, so it cools faster. (The other statements are false or irrelevant: the glass particles do have thermal energy, and "the air is warmer than the mug" is not generally true.)
Brief explanation: heat leaves the hot beverage by conduction and convection through the mug material and by radiation. An empty space (especially a vacuum) between two glass layers removes the medium for conduction and convection because there are no (or very few) particles to carry heat, so heat flow is greatly reduced. A single-layer ceramic mug conducts heat through its material more readily, so it cools faster. (The other statements are false or irrelevant: the glass particles do have thermal energy, and "the air is warmer than the mug" is not generally true.)
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