Length2.74 m
9.13Celery stalks
1.9 hundredthsGreat Pyramid heights
Steinway Model D concert grand
Photo from Wikimedia Commons
Grand Piano
Two tonnes of wire, wood, and exquisite tension/Everyday Objects
A concert grand piano (Steinway Model D) is about 2.74 meters long, weighs approximately 480 kg, and contains about 230 steel strings under a combined tension of roughly 200,000 newtons (20 tonnes). The cast iron plate inside must withstand this enormous force without warping. Each of the 88 keys can produce dynamics from pianissimo to fortissimo, and the entire instrument has a frequency range from 27.5 Hz (A0) to 4,186 Hz (C8).
Measurements
Weight480 kg
960,000Hummingbird eggs
48 sextillionRhinovirus particles
About 480 kg; requires professional movers
Total string tension200,000 N
4 tenthsCrane cables
287Tennis serves
1 millionChicken nugget weights
About 20 tonnes of tension across all strings
Lowest note frequency (A0)27.5 Hz
11Jump rope swings
65.3 billionHalley's Comet orbits
The lowest A on the keyboard
Highest note frequency (C8)4,186 Hz
1.31Smoke detector beeps
1.8 tenthsDog whistles
279Car engines idling
The highest C on the keyboard
Width1.57 m
31.1AA battery lengths
3.1 hundredthsOlympic pool lengths
1.72Walking canes
About 1.57 meters at the widest point
Longest string length2 m
250,000Red blood cells
8Wrench lengths
2.1 tenthsSquash court lengths
Bass strings up to 2 meters long