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Arch
STRUCTURE & PHYSICSbeginner
Definition
A curved structural element that spans an opening by converting vertical loads into compressive forces directed along its curve and outward to its supports (abutments). Because all forces are in compression, arches can be built from materials strong only in compression, like stone or brick.
Example
The Pont du Gard aqueduct in southern France (circa 19 BC) uses three tiers of semicircular stone arches to carry water across a valley — the lower arches bearing the weight of those above.