Pound per square inch (psi)
Definition
Pounds-force per square inch, exactly 6894.757293168 pascals.
History
The pound per square inch comes from the imperial system, expressing pressure as pounds-force spread over a square inch. It equals about 6895 pascals.
Where it is used
Psi is the everyday pressure unit in the United States for tyre pressure, plumbing and compressed air.
Typical uses include tyre pressure in the US, plumbing, compressed air.
Conversion pages
These pages convert pound per square inch to or from another unit in pressure.