Engineering English
Pressure Drop
Mechanical Engineering · Chemical Engineering · Environmental Engineering · Last updated: July 30, 2026 · How this entry was written
Definition: Pressure drop is the decrease in static pressure of a fluid as it flows through a pipe, valve, or fitting due to friction and changes in flow area.
Example in context
“The pressure drop across the control valve must be within the recommended range to ensure stable operation.”
“Kontrol vanasındaki basınç düşüşü, kararlı çalışmayı sağlamak için önerilen aralıkta olmalıdır.”
Where engineers use it
Pressure drop calculations are essential when sizing pipes, selecting valves, and designing pumping systems to ensure adequate flow and avoid cavitation.
Synonyms: pressure loss, ΔP
Antonyms: pressure gain
In Chemical Engineering
Pressure drop is the decrease in fluid pressure as it flows through a pipe, valve, fitting, or equipment due to friction and changes in flow geometry. It is a key parameter for pump sizing and system design.
“The pressure drop across the control valve was 2 bar, which we accounted for in the pump head calculation.”
In Environmental Engineering
The loss of static pressure that a gas stream experiences while passing through ducting or a control device, usually expressed in pascals or millimetres of water column. It directly determines the fan power an air cleaning system consumes.
“Rising pressure drop across the collector added twelve kilowatts of continuous fan load and signalled that the filter media were blinding.”
Practice: can you use “Pressure Drop” at work?
You are reviewing a piping layout for a chemical plant. The pressure drop through a long header is too high. Propose a change to reduce it.
Show a model answer
“What is the allowable pressure drop for this pipe segment at the maximum flow rate?”
“Pressure Drop” in 21 languages
| English | Pressure Drop |
|---|---|
| Turkish | basınç düşüşü |
| French | chute de pression |
| German | Druckabfall |
| Spanish | caída de presión |
| Chinese | 压降 |
| Arabic | انخفاض الضغط |
| Portuguese | queda de pressão |
| Russian | перепад давления |
| Japanese | 圧力損失 |
| Italian | caduta di pressione |
| Vietnamese | sụt áp |
| Hindi | दबाव पतन |
| Thai | แรงดันตก |
| Indonesian | penurunan tekanan |
| Korean | 압력 강하 |
| Bengali | চাপ হ্রাস |
| Dutch | drukval |
| Swedish | tryckfall |
| Finnish | paineen lasku |
| Ukrainian | перепад тиску |
Frequently asked questions
What does Pressure Drop mean in engineering?
Pressure drop is the decrease in static pressure of a fluid as it flows through a pipe, valve, or fitting due to friction and changes in flow area. In Mechanical Engineering, the term carries a usage-frequency rating of 10/10 in the Engineering English library.
How do you pronounce Pressure Drop?
Pressure Drop is pronounced /ˈprɛʃər drɒp/ (IPA). The Engineering English app plays audio for the term and checks your pronunciation with speech recognition.
How is Pressure Drop used in a sentence?
Example from an engineering context: “The pressure drop across the control valve must be within the recommended range to ensure stable operation.”
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