Pascal SI Unit Pressure — FRCA Primary MCQ
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Correct answer: D — Pascal (Pa)
The Pascal (Pa) is the SI unit of pressure (1 Pa = 1 N/m²). In clinical practice kilopascals (kPa) are commonly used: 1 kPa = 1000 Pa ≈ 7.5 mmHg ≈ 10.2 cmH2O. Other units: 1 atm = 101.3 kPa = 760 mmHg = 1013 mbar. Blood gas tensions are reported in kPa (UK) or mmHg (USA).
Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment