| 单词 | relative density |
| 释义 | relative density(r.d.) The ratio of the density of a substance to the density of some reference substance. For liquids or solids it is the ratio of the density (usually at 20°C) to the density of water (at its maximum density). This quantity was formerly called specific gravity . Sometimes relative densities of gases are used; for example, relative to dry air, both gases being at s.t.p |
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