Engine : Electricity - 216/1386
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| When a hydrometer indicates specific gravity what is being compared? |
| A) mass of substance measured with the density of the same substance |
| B) density of a substance in water with the density of the same substance in air |
| C) differences in weight between water and the mass of the liquid being measured |
| D) buoyancy of the indicator in the liquid being measured as compared to water |
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