Which one of the following substances will float in gasoline, which has a density of 0.66 g/mL?

Question

BlackTom AI · Accepted Answer

First, let's restate what's being asked: which substance will float in gasoline, given gasoline's density is 0.66 g/mL?
Option 1: table salt (density = 2.16 g/mL). Salt is well above the gasoline density, so it would be denser than the liquid and would sink rather than float. This makes it unsuitable for floating in gasoline.
Option 2: sugar (density = 1.59 g/mL). Sugar also has a density greater than gasoline, so it would sink in gasoline rather than float.
Option 3: aluminum (density = 2.70 g/mL). Aluminum is a metal with a much higher density than gasoline, and in a lighter-than-liquid sense, it would sink. Metals with densities well above 0.66 g/mL do not float in gasoline.
Option 4: mercury (density = 13.6 g/mL). Mercury is extremely dense compared to gasoline, so it would certainly sink rather than float.
Option 5: balsa wood (density = 0.16 g/mL). This substance has a density significantly lower than gasoline, so it is buoyant in gasoline and will float.
In this comparison, buoyancy is determined by whether the object's density is less than the liquid's density. Only substances with a density less than 0.66 g/mL will float in gasoline. The other options all exceed 0.66 g/mL, so they would not float. The balsa wood, with a density of 0.16 g/mL, meets the floating criterion and thus would rise to the surface when placed in gasoline.

Which one of the following substances will float in gasoline, which has a density of 0.66 g/mL? 单项选择题

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