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A little wonder, every day

piano string tension

a technician working on the exposed mechanism of an upright piano. Barbara Mürdter, 2006. Wikimedia Commons file page: https://commons.wikimedia.org/wiki/File:Piano_tuner.jpg. CC BY-SA 3.0 or 2.5; attribution: “Barbara Mürdter / Wikimedia Commons”; link the license; no edits.
technician adjusting the tuning pins and strings of an upright piano. Goran Andjelic, 2008. Wikimedia Commons file page: https://commons.wikimedia.org/wiki/File:Piano_tuning.jpg. CC BY-SA 4.0 (also older listed variants); attribution: “Goran Andjelic / Wikimedia Commons”; link the license; no edits.
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a technician working on the exposed mechanism of an upright piano. Barbara Mürdter, 2006. Wikimedia Commons file page: https://commons.wikimedia.org/wiki/File:Piano_tuner.jpg. CC BY-SA 3.0 or 2.5; attribution: “Barbara Mürdter / Wikimedia Commons”; link the license; no edits.

Listen to fact0:00 / —

The roughly 230 strings in a typical acoustic piano pull on its frame with a combined force of about 18 tonnes; large concert grands can reach higher values. If every note is lowered evenly by a semitone, the total tension falls by roughly two tonnes. This is an estimate: the result depends on the particular instrument and its starting pitch.