Discussion
A specimen weighing 78 g displaces 30 cm\( ^3 \) of water. Its specific gravity is
Answer: D
Correct answer: 2.6
Specific gravity is the mass divided by the mass of an equal volume of water, and 30 cm³ of water has a mass of 30 g: \[ \frac{78}{30} = 2.6. \] The figure is characteristic of quartz and the feldspars, so a specimen at 2.6 in an ordinary rock is most likely one of them.
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