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The 1959 international agreement defined the inch as exactly 25.4 mm to create a precise relationship between imperial and metric. This wasn't arbitrary - it was close to existing definitions while creating an exact conversion. The precision eliminates rounding errors in international trade and manufacturing.

No, screen sizes measure only the viewable display area diagonally. A 55" TV has a 55-inch (139.7 cm) diagonal screen, but the entire TV with bezel might be 123 cm wide. Always check complete dimensions when planning installations.

Historical momentum from US market dominance in early electronics. Consumers understand '15-inch laptop' better than '38.1 cm laptop'. Internally, these devices are designed in millimeters - only marketing uses inches.

First convert the fraction to decimal, then multiply by 2.54. Example: 3/8" = 0.375" × 2.54 = 0.9525 cm. Common fractions: 1/4" = 0.635 cm, 1/2" = 1.27 cm, 3/4" = 1.905 cm.

It depends. Screen sizes are usually exact (±1mm), but many products use nominal sizing. A '2-inch' pipe fitting isn't 2 inches anywhere on it. Always verify whether measurements are actual or nominal for critical applications.