絕壓/表壓/差壓轉換器（含步驟）
使用此工具進行轉換 絕對壓力 （P腹肌） 和 儀表壓力 （Pg）使用大氣壓力（PATM), and to calculate 差異 (ΔP) between two points. It shows the full calculation process so engineers can verify the method, document results, and copy the output into reports.
絕對 ⇄ 表壓（需要大氣壓力）
壓力差 (P1 – P2)
絕對壓力、表壓和差壓之間有什麼區別？
絕對壓力 (Pabs) is referenced to a perfect vacuum (0 Pa absolute). It is the value you typically need for gas laws,
altitude/barometric calculations, and many vacuum applications.
表壓 (Pg) is referenced to local atmospheric pressure (Patm). Most industrial pressure gauges and many process sensors
report gauge pressure because it directly indicates pressure above ambient.
壓力差（ΔP） is the difference between two pressures (P1 and P2), widely used for filters, flow across an orifice/venturi,
HVAC airflow, and level measurement in tanks.
工程中最常見的關係： Pabs = Pg + Patm. If you know any two of these values, you can solve the third.
快速壓力換算表（一般參考點）
These quick conversions help you sanity-check results. Values below use standard relationships and typical constants (e.g., 1 atm = 101.325 kPa, 1 bar = 100 kPa, 1 psi = 6.894757 kPa).
| 共同價值觀 | KPA | 酒吧 | 磅/平方英寸 | 帕 | ATM |
|---|
提示：如果您在真空範圍內工作，請考慮使用絕對壓力單位，並僅在特定儀器或規格表需要時才轉換為表壓。
常見問題：絕壓、表壓、差壓
1) 如何將表壓轉換為絕對壓力？
將大氣壓力添加到表壓： Pabs = Pg + Patm. For example, if Pg = 200 kPa and Patm = 101.325 kPa, then Pabs = 301.325 kPa.
2) 如何將絕對壓力轉換為表壓？
從絕對壓力減去大氣壓力： Pg = Pabs – Patm. This tells you pressure above ambient.
3）為什麼大氣壓力在這些轉換中很重要？
Gauge pressure is defined relative to the surrounding atmosphere. If you change altitude or local weather, Patm changes slightly, which changes the gauge/absolute relationship.
4) 差壓與表壓相同嗎？
不會。表壓在某一點參考大氣，而壓差則比較兩點： ΔP = P1 - P2。壓力差通常用於過濾器、盤管和流量元件。
5) 我可以用表壓計算 ΔP 嗎？
Yes—if both readings are taken with the same reference (both gauge or both absolute). When both are gauge, the atmospheric reference cancels out in the difference.
6) 典型的大氣壓力值是多少？
標準海平面大氣壓力為 101.325千帕 (1 atm). For higher accuracy, use a local barometer value, especially in altitude-sensitive measurements.