| 单词 | unit mass |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔heat of combustion〕The amount of heat released per unit mass or unit volume of a substance when the substance is completely burned.燃烧热：每单位质量或体积的物质完全燃烧后所释放出的热量美国传统〔heat of fusion〕The amount of heat required to convert a unit mass of a solid at its melting point into a liquid without an increase in temperature.熔解热：将每单位固态物质在熔点变成液态而不升高温度所需的热量美国传统〔heat of vaporization〕The amount of heat required to convert a unit mass of a liquid at its boiling point into vapor without an increase in temperature.汽化热：将单位物质的液体在沸点气化而不升高温度所需的热量美国传统 |
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