Final answer:
The question about Elly's revelation regarding the icebox in the kitchen is unclear without specific context, but it may refer to the icebox's temperature, contents, or origin, relating to its thermal properties and functionality.
Step-by-step explanation:
The student's question about what Elly reveals about the icebox in the kitchen seems to be referencing specific details within a text or study material, which aren't entirely clear within this context. However, based on the provided reference information, we can deduce that the question might be related to the thermal properties of ice and how an icebox operates to keep its contents cold.
In relation to the reference information provided, we could speculate that Elly might reveal either the temperature of the icebox, its contents, or its origin, but without the direct text or context, it's challenging to provide a specific answer.
A 19th-century icebox actually used ice to keep food cold by taking advantage of ice's higher specific heat compared to the surrounding air. Likewise, the examples detailed in the reference information demonstrate how ice absorbs heat from its environment up until it reaches 0°C, where it begins to melt without a temperature change, a process that relies on ice's latent heat of fusion.
The thermal conductivity of the materials used for an icebox and the amount of heat that ice absorbs are other factors that significantly affect how effective an icebox is at maintaining its cold temperature.