Square Inches
Abbreviation/Symbol:
in2
sq in
Unit of:
Worldwide use:
Square inches are used mainly in the United States for small areas, and for pressure – psi is pounds per square inch.
Definition:
A square inch is the area of a square one inch on each side, which is exactly 6.4516 square centimeters.
Origin:
A square inch is the area of a square one inch on each side, which is exactly 6.4516cm². It is the 'square' in psi, pounds per square inch.
Usage context:
Square inches are best known as the area in psi, pounds per square inch: a car tire at 32 psi pushes with 32 pounds of force on every square inch of its inside surface. One square inch is exactly 6.4516 square centimeters.
Square inches are also commonly used in the field of engineering, particularly in mechanical and electrical engineering. Engineers use this unit to measure the surface area of components, such as circuit boards or mechanical parts. This helps them determine the efficiency and functionality of these components, as well as calculate the required dimensions for proper integration into larger systems.