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Question:

Clamp a small piece of aluminum foil with a crucible tongs and heat it to molten light on an alcohol lamp,

With a small crucible clamping of aluminum foil, heating to melt, the alcohol lamp gently shaking, observed foil melting, lose luster, but the molten aluminum does not fall, like a layer of film bag, please answer the reasons for this phenomenon ______.

Answer:

Lost luster; because of the high melting point of alumina, the inner layer of molten aluminum wrapped up by the oxide film does not drip when heated,
Crucible tongs clamped a piece of aluminum foil, due to the low melting point, so the alcohol lamp heating aluminum melting
The answer is: the high melting point of the oxide film, the inner layer of molten aluminum wrapped up by the oxide film when it is heated and will not drip

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