💧 相对湿度计算器（露点 ↔ 相对湿度、绝对湿度）Relative Humidity Calculator (Dew Point ↔ RH, Absolute Humidity)

使用说明与常见问题How-to & FAQ

「相对湿度计算器（露点 ↔ 相对湿度、绝对湿度）」是什么？What is the Relative Humidity Calculator (Dew Point ↔ RH, Absolute Humidity) tool?

用 Magnus 公式在气温、露点和相对湿度之间互算：由气温和露点求相对湿度，或由气温和相对湿度求露点。同时给出饱和水汽压、实际水汽压、绝对湿度 (g/m³) 和混合比。支持 °C 和 °F。本地处理。Converts between air temperature, dew point and relative humidity with the Magnus formula: RH from temperature and dew point, or dew point from temperature and RH. Also gives saturation and actual vapour pressure, absolute humidity in g/m³ and mixing ratio. °C or °F. Processed locally.

如何使用「相对湿度计算器（露点 ↔ 相对湿度、绝对湿度）」？How do I use the Relative Humidity Calculator (Dew Point ↔ RH, Absolute Humidity) tool?

在「相对湿度计算器（露点 ↔ 相对湿度、绝对湿度）」中，填写「求」、「温度单位」、「气温」、「露点」、「相对湿度 %」等参数，结果会随输入实时计算并显示在下方。In the Relative Humidity Calculator (Dew Point ↔ RH, Absolute Humidity): Fill in "Find", "Temperature unit", "Air temperature", "Dew point", "Relative humidity %"; results are recalculated instantly as you type.

相对湿度怎么算？How is relative humidity calculated?

RH = 实际水汽压 ÷ 同温度下的饱和水汽压 × 100 %。实际水汽压等于露点温度下的饱和水汽压，饱和水汽压用 Magnus 公式 6.112·exp(17.67T/(T + 243.5)) hPa 计算。RH = actual vapour pressure ÷ saturation vapour pressure at the air temperature × 100 %. The actual vapour pressure is the saturation pressure at the dew point, using the Magnus formula 6.112·exp(17.67T/(T + 243.5)) hPa.

露点是什么？What is the dew point?

空气在水汽含量不变的情况下冷却到饱和（RH = 100 %）时的温度。露点越高，空气越闷；露点与气温越接近，越容易起雾或结露。The temperature at which air becomes saturated (RH = 100 %) if cooled without changing its moisture. A higher dew point feels muggier, and when it nears the air temperature, fog and condensation form.

绝对湿度和相对湿度有什么区别？How do absolute and relative humidity differ?

绝对湿度是每立方米空气中水汽的克数，与温度无关地衡量水汽多少；相对湿度是相对于该温度可容纳最大值的百分比，同样的水汽在较冷时 RH 更高。Absolute humidity is grams of water vapour per cubic metre of air; relative humidity is the percentage of the maximum air can hold at that temperature, so the same moisture gives a higher RH in cooler air.

能举个计算实例吗？Can you show a worked example?

例如在「相对湿度计算器（露点 ↔ 相对湿度、绝对湿度）」中填 求 = 相对湿度（已知露点），温度单位 = °C，气温 = 25，露点 = 25，结果区显示：相对湿度：100 %；露点差（气温 − 露点）：0 °C；饱和水汽压：31.674 hPa；实际水汽压：31.674 hPa；绝对湿度：23.02 g/m³；混合比：20.07 g/kg；室内湿度参考（15–30 °C）：高于常用的 30–60 % 室内范围For example, entering Find = Relative humidity (from dew…, Temperature unit = °C, Air temperature = 25, Dew point = 25 in the Relative Humidity Calculator (Dew Point ↔ RH, Absolute Humidity) gives: Relative humidity: 100 %; Dew point spread: 0 °C; Saturation vapour pressure: 31.674 hPa; Actual vapour pressure: 31.674 hPa; Absolute humidity: 23.02 g/m³; Mixing ratio: 20.07 g/kg; Indoor humidity guide (15–30 °C): above the usual 30–60 % indoor range

哪些输入会被检查？Which inputs are validated?

「相对湿度计算器（露点 ↔ 相对湿度、绝对湿度）」会检查这些输入——「气温」、「露点」：所选方式用到时必须填写；「相对湿度 %」：可留空；「气压 hPa（混合比用）」：须大于实际水汽压（留空按 1013.25 hPa）；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Relative Humidity Calculator (Dew Point ↔ RH, Absolute Humidity) checks its inputs — "Air temperature", "Dew point": required when the chosen option uses it; "Relative humidity %": optional; "Pressure hPa (for mixing ratio)": must be above the actual vapour pressure (blank uses 1013.25 hPa); numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「相对湿度计算器（露点 ↔ 相对湿度、绝对湿度）」的设置：「求」可选 相对湿度（已知露点）、露点（已知相对湿度）（默认 相对湿度（已知露点））；「温度单位」可选 °C、°F（默认 °C）；「气温」默认 25；「露点」默认 15；「相对湿度 %」默认 50；「气压 hPa（混合比用）」默认 1013.25。每次生成结果都按当前设置处理。Settings in the Relative Humidity Calculator (Dew Point ↔ RH, Absolute Humidity) — "Find": Relative humidity (from dew point), Dew point (from RH) (default Relative humidity (from dew point)); "Temperature unit": °C, °F (default °C); "Air temperature" default 25; "Dew point" default 15; "Relative humidity %" default 50; "Pressure hPa (for mixing ratio)" default 1013.25. The result always uses the current settings.

计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?

「相对湿度计算器（露点 ↔ 相对湿度、绝对湿度）」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Relative Humidity Calculator (Dew Point ↔ RH, Absolute Humidity) uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.

「相对湿度计算器（露点 ↔ 相对湿度、绝对湿度）」免费吗？需要注册吗？Is the Relative Humidity Calculator (Dew Point ↔ RH, Absolute Humidity) free? Do I need an account?

「相对湿度计算器（露点 ↔ 相对湿度、绝对湿度）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Relative Humidity Calculator (Dew Point ↔ RH, Absolute Humidity) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.