PSI (psi)
Pounds per square inch (psi) is the pressure unit of US customary engineering.
- Origin
- Derived from the avoirdupois pound-force acting on one square inch.
- Where it is used
- Used for piping, pneumatics, hydraulic systems and US material strengths.
- Relation to SI
- 1 psi = 6,894.757 Pa, about 6.895 kPa.