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*Question:* The recommended tire pressure in a Honda Civic is 28 psi (pounds per
square inch). What is this pressure in atmospheres (1 atmosphere is
)?

*Answer:* First, 28 pounds per
square inch is the same as
pounds per square
foot (the standard fps unit of pressure).
Now, 1 pound equals Newtons (the standard SI unit of force), and
1 foot equals m (see Tab. 2). Hence,

It follows that 28 psi is equivalent to atmospheres.

Richard Fitzpatrick
2006-02-02