Engineering English
Pressure Ratio
Mechanical Engineering · Last updated: July 30, 2026 · How this entry was written
Definition: Pressure ratio is the ratio of the absolute discharge pressure to the absolute suction pressure in a compressor or pump. It is a key parameter for determining the work required and the stage configuration.
Example in context
“The compressor design requires a pressure ratio of 4:1 for the first stage to achieve the desired discharge conditions.”
“Kompresör tasarımı, istenen boşaltma koşullarını elde etmek için ilk kademede 4:1 basınç oranı gerektirir.”
Where engineers use it
Pressure ratio is fundamental in compressor thermodynamics and design. Engineers use it to compute the required power, number of stages, and to select sealing and cooling systems. It also influences surge and stall limits.
Synonyms: compression ratio
Antonyms: expansion ratio
Practice: can you use “Pressure Ratio” at work?
You are evaluating a multistage centrifugal compressor for a gas processing plant. The required overall pressure ratio is 24:1. Decide how to split the ratio across stages considering intercooling and aerodynamic loading.
Show a model answer
“Determine the pressure ratio across the compressor stage to calculate the discharge temperature.”
“Pressure Ratio” in 21 languages
| English | Pressure Ratio |
|---|---|
| Turkish | Basınç Oranı |
| French | Rapport de Pression |
| German | Druckverhältnis |
| Spanish | Relación de Presión |
| Chinese | 压比 |
| Arabic | نسبة الضغط |
| Portuguese | Relação de Pressão |
| Russian | Степень сжатия |
| Japanese | 圧力比 |
| Italian | Rapporto di Pressione |
| Vietnamese | Tỷ số áp suất |
| Hindi | दबाव अनुपात |
| Thai | อัตราส่วนความดัน |
| Indonesian | Rasio Tekanan |
| Korean | 압력비 |
| Bengali | চাপ অনুপাত |
| Dutch | Drukverhouding |
| Swedish | Tryckförhållande |
| Finnish | Painesuhde |
| Ukrainian | Ступінь стиску |
Frequently asked questions
What does Pressure Ratio mean in engineering?
Pressure ratio is the ratio of the absolute discharge pressure to the absolute suction pressure in a compressor or pump. It is a key parameter for determining the work required and the stage configuration. In Mechanical Engineering, the term carries a usage-frequency rating of 10/10 in the Engineering English library.
How do you pronounce Pressure Ratio?
Pressure Ratio is pronounced /ˈprɛʃər ˈreɪʃioʊ/ (IPA). The Engineering English app plays audio for the term and checks your pronunciation with speech recognition.
How is Pressure Ratio used in a sentence?
Example from an engineering context: “The compressor design requires a pressure ratio of 4:1 for the first stage to achieve the desired discharge conditions.”
This entry is one of 7,806 terms in the Engineering English iOS app — with quizzes, spaced repetition and pronunciation checking.
Get the app on the App Store