Definition
A kilopascal (kPa) is a metric unit of pressure equal to 1,000 pascals, where one pascal is the pressure produced by a force of one newton acting on an area of one square meter. It is commonly used to express atmospheric pressure, manifold pressure, and fluid or gas pressures in aviation maintenance.
Plain English
A unit used to measure how hard something is pressing or pushing, like air or oil pressure. One kilopascal equals 1,000 pascals.
Context Anchor
Seen in maintenance manuals, pressure limits, test equipment, and system specifications that use metric pressure units.
Derivation
From 'kilo-' (Greek 'chilioi', meaning thousand) and 'pascal', named after Blaise Pascal, the 17th-century French scientist who studied pressure in fluids. So a kilopascal is simply 'one thousand pascals'.
Why Pilots Care
Many engine and system specifications, especially on aircraft built or documented outside the United States, list pressures in kilopascals. Knowing the unit prevents misreading a value or applying the wrong limit.
Grounding Statement
Standard sea-level atmospheric pressure is about 101.3 kilopascals — roughly the weight of the air pressing down on every square meter at sea level.
Example Sentence 1
The maintenance manual specified an oil pressure of 350 kilopascals at cruise rpm.
Example Sentence 2
During the preflight check the technician noted the hydraulic system pressure reading in kilopascals.