当你停在加油站为汽车轮胎充气时，你可能会看到仪表盘上显示着“PSI”。而当你观看天气预报时，气象员会提到“百帕（hPa）”。在实验室里，科学家则谈论“帕斯卡（Pa）”。这些五花八门的单位究竟代表了多大的力量？
When you stop at a gas station to pump your tires, you see "PSI". When you watch the weather, the meteorologist mentions "hPa". In labs, scientists talk about "Pascals (Pa)". What do all these different units actually mean in terms of force?
1. 什么是压强？ / What is Pressure?
在物理学中，压强定义为作用在单位面积上的力。公式非常直观：P = F / A。帕斯卡（Pa）作为国际标准单位，定义为 1 牛顿的力垂直作用在 1 平方米的面积上。由于 1 Pa 的压力非常微小（大约相当于一张纸平铺在桌面上的压力），我们通常使用千帕（kPa）或兆帕（MPa）。
In physics, pressure is defined as force per unit area: P = F / A. The Pascal (Pa) is the SI unit, defined as 1 Newton per square meter. Since 1 Pa is tiny (roughly the pressure of a single sheet of paper on a table), we usually use kPa or MPa.
2. PSI 与 Bar：美系与欧系的博弈 / PSI vs Bar
PSI（Pounds per Square Inch，每平方英寸磅力）是英制单位。在北美和中国，大多数汽车轮胎压力都以 PSI 为准（通常在 30-35 PSI 之间）。而 Bar 是欧洲常用的单位，1 Bar 约等于 1 个标准大气压。它们的换算关系大约是：1 Bar ≈ 14.5 PSI。
PSI (Pounds per Square Inch) is an Imperial unit. In North America and China, most car tire pressures are measured in PSI (usually 30-35 PSI). Bar is common in Europe, with 1 Bar being roughly equal to 1 standard atmosphere. The conversion is: 1 Bar ≈ 14.5 PSI.
全球压力单位换算表 / Pressure Conversion Chart
| Unit Name | Pascals (Pa) | Bar (approx) | PSI (approx) |
|---|---|---|---|
| 1 Pascal | 1 | 0.00001 | 0.000145 |
| 1 kPa | 1,000 | 0.01 | 0.145 |
| 1 Bar | 100,000 | 1 | 14.503 |
| 1 ATM (Atmosphere) | 101,325 | 1.013 | 14.696 |
结论 / Conclusion
无论是工业生产、潜水探险还是日常行车，压强单位的准确转换都关乎安全。如果你遇到不熟悉的单位，或者需要进行高精度的科学计算，欢迎使用我们的 专业压力换算工具。只需输入数值，剩下的交给我们。
Whether in industrial production, diving adventures, or daily driving, accurate pressure conversion is about safety. If you encounter unfamiliar units, use our Professional Pressure Converter. Just enter the value, and we'll handle the rest.