Consider a steaming aluminum soda-pop can that contains a small amount of boiling water. When it is quickly inverted into a bath of cooler water the can is dramatically crushed by atmospheric pressure. This occurs because the pressure inside the can is rapidly reduced by

Question

BlackTom AI · Accepted Answer

The scenario involves a steaming aluminum can quickly inverted into cooler water, and the can is crushed by atmospheric pressure as the internal pressure drops. Here’s how to evaluate each option step by step.
Option 1: 'sudden slowing of the air and steam molecules inside.' This wording suggests a kinetic change in molecular motion rather than a change in the number of gas particles or their phase. While cooling slows molecules, the key effect that reduces pressure here is not simply slower motion but a change in the amount of vapor due to phase change, so this is not the primary mechanism.
Option 2: 'rapid conduction of heat to the relatively cool water.' Rapid heat transfer does occur, cooling the contents, but conduction itself does not directly cause a drop in internal pressure unless it leads to a phase change of the vapor inside. Heat transfer is a trigger, not the direct cause of pressure reduction.
Option 3: 'contact with the relatively cool water.' This describes the external interaction that cools the can, but the physical mechanism that reduces internal pressure is the fate of the internal steam, not merely the contact itself. The mere contact is part of the cooling process, not the pressure-reducing event by itself.
Option 4: 'reduced internal energy.' While cooling lowers internal energy, the crucial outcome for pressure is the condensation of vapor, which reduces the number of gas particles in the can. Saying 'reduced internal energy' is vague and incomplete as an explanation for the rapid pressure drop.
Option 5: 'condensation of steam inside.' When the hot steam within the can encounters the suddenly cooler external environment, it condenses back into liquid water. Condensation reduces the number of gas molecules inside the can, which dramatically lowers the internal pressure and allows the external atmospheric pressure to crush the can. This directly links the temperature change to a phase change and a pressure change, making it the correct mechanism.
In summary, many options touch on heating, cooling, or energy changes, but the decisive factor here is the phase change of the interior vapor—condensing steam reduces the internal pressure, enabling the surrounding air to crush the can.

Consider a steaming aluminum soda-pop can that contains a small amount of boiling water. When it is quickly inverted into a bath of cooler water the can is dramatically crushed by atmospheric pressure. This occurs because the pressure inside the can is rapidly reduced by 单项选择题

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