🧪 分压计算器（道尔顿分压定律，多组分与单位换算）Partial Pressure Calculator (Dalton Law, Several Gases, Unit Conversion)

使用说明与常见问题How-to & FAQ

「分压计算器（道尔顿分压定律，多组分与单位换算）」是什么？What is the Partial Pressure Calculator (Dalton Law, Several Gases, Unit Conversion) tool?

按道尔顿分压定律计算：由摩尔分数和总压求分压；由各组分的物质的量（每行“名称, 摩尔数”）求每种气体的摩尔分数和分压；或由各组分分压求总压和摩尔分数。支持 Pa、kPa、atm、bar、mmHg 和 psi。本地处理。Use Dalton law to get a partial pressure from the mole fraction and total pressure; the mole fraction and partial pressure of each gas from amounts in moles (one line each: name, moles); or the total pressure and mole fractions from each partial pressure. Works in Pa, kPa, atm, bar, mmHg and psi. Processed locally.

如何使用「分压计算器（道尔顿分压定律，多组分与单位换算）」？How do I use the Partial Pressure Calculator (Dalton Law, Several Gases, Unit Conversion) tool?

在「分压计算器（道尔顿分压定律，多组分与单位换算）」中，填写「计算」、「摩尔分数（0–1）」、「总压」、「压强单位」等参数，结果会随输入实时计算并显示在下方。In the Partial Pressure Calculator (Dalton Law, Several Gases, Unit Conversion): Fill in "Calculate", "Mole fraction (0–1)", "Total pressure", "Pressure unit"; results are recalculated instantly as you type.

道尔顿分压定律是什么？What is Dalton law?

混合气体的总压等于各组分分压之和，每种气体的分压 = 它的摩尔分数 × 总压。适用于近似理想气体、彼此不反应的混合物。The total pressure of a gas mixture is the sum of the partial pressures, and each partial pressure = mole fraction × total pressure. It holds for nearly ideal gases that do not react.

空气中氧气的分压是多少？What is the partial pressure of oxygen in air?

干空气中氧气约占 20.95 %，在海平面 101.325 kPa 时分压约 21.2 kPa（约 159 mmHg）。高海拔时总压下降，氧分压也随之下降。Oxygen is about 20.95 % of dry air, so at sea level (101.325 kPa) its partial pressure is about 21.2 kPa (about 159 mmHg). At altitude the total, and so the oxygen partial pressure, falls.

单位怎么换算？How do the units convert?

1 atm = 101325 Pa = 101.325 kPa = 1.01325 bar = 760 mmHg ≈ 14.696 psi。1 atm = 101325 Pa = 101.325 kPa = 1.01325 bar = 760 mmHg ≈ 14.696 psi.

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

例如在「分压计算器（道尔顿分压定律，多组分与单位换算）」中填 计算 = 摩尔分数 × 总压，摩尔分数（0–1） = 0.21，总压 = 101325，压强单位 = Pa，结果区显示：分压：21,278.25 Pa；21.27825 kPa = 0.21 atm = 159.6 mmHgFor example, entering Calculate = Mole fraction × total, Mole fraction (0–1) = 0.21, Total pressure = 101325, Pressure unit = Pa in the Partial Pressure Calculator (Dalton Law, Several Gases, Unit Conversion) gives: Partial pressure: 21,278.25 Pa; 21.27825 kPa = 0.21 atm = 159.6 mmHg

哪些输入会被检查？Which inputs are validated?

「分压计算器（道尔顿分压定律，多组分与单位换算）」会检查这些输入——「摩尔分数（0–1）」：所选方式用到时必须填写；「总压」：所选方式用到时必须填写，须大于 0；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 Partial Pressure Calculator (Dalton Law, Several Gases, Unit Conversion) checks its inputs — "Mole fraction (0–1)": required when the chosen option uses it; "Total pressure": required when the chosen option uses it, must be greater than 0; 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?

「分压计算器（道尔顿分压定律，多组分与单位换算）」的设置：「计算」可选 摩尔分数 × 总压、由各组分摩尔数、由各组分分压求总压（默认 摩尔分数 × 总压）；「摩尔分数（0–1）」默认 0.21；「总压」默认 101325；「压强单位」可选 Pa、kPa、atm、bar、mmHg、psi（默认 Pa）。每次生成结果都按当前设置处理。Settings in the Partial Pressure Calculator (Dalton Law, Several Gases, Unit Conversion) — "Calculate": Mole fraction × total, From moles of each gas, Total from partial pressures (default Mole fraction × total); "Mole fraction (0–1)" default 0.21; "Total pressure" default 101325; "Pressure unit": Pa, kPa, atm, bar, mmHg, psi (default Pa). 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?

「分压计算器（道尔顿分压定律，多组分与单位换算）」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 Partial Pressure Calculator (Dalton Law, Several Gases, Unit Conversion) 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.

「分压计算器（道尔顿分压定律，多组分与单位换算）」免费吗？需要注册吗？Is the Partial Pressure Calculator (Dalton Law, Several Gases, Unit Conversion) free? Do I need an account?

「分压计算器（道尔顿分压定律，多组分与单位换算）」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 Partial Pressure Calculator (Dalton Law, Several Gases, Unit Conversion) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.