Pressure Change Formula |
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\( \Delta p \;=\; p_h - p_l\) (Pressure Change) \( p_h \;=\; \Delta p + p_l\) \( p_l \;=\; p_h - \Delta p \) |
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| Symbol | English | Metric |
| \( \Delta p \) = Pressure Change | \(lbf \;/\; in^2\) | \(Pa\) |
| \( p_h \) = High Pressure | \(lbf \;/\; in^2\) | \(Pa\) |
| \( p_l \) = Low Pressure | \(lbf \;/\; in^2\) | \(Pa\) |
Pressure change, abbreviated as \(\Delta p\), is the difference in pressure between two points or states within a system and describes how pressure increases or decreases due to physical processes or external influences. It commonly occurs in fluids and gases as a result of flow resistance, elevation differences, temperature changes, or mechanical work such as compression and expansion. In fluid systems, pressure change is often caused by frictional losses in pipes, fittings, or equipment, or by energy added or removed by pumps and turbines. It is a key parameter in engineering and physics because it determines fluid motion, energy transfer, and system performance.
