Outer diameter1.9 hundredths m
7.9 thousandthsGolf cart lengths
33.9 millionSalt crystals
Sized for a hobbit finger
Photo from Wikimedia Commons
The One Ring
The ruling ring forged by Sauron in the fires of Mount Doom/Mythical & Fictional
The One Ring from Tolkien's Lord of the Rings is a plain gold band forged by the Dark Lord Sauron in the volcanic fires of Mount Doom. At roughly 19 millimeters in diameter and 21 grams in mass, it is physically indistinguishable from an ordinary gold ring. Its most remarkable physical property is that it can only be destroyed at the specific temperature of its forging, estimated around 1100 degrees Celsius. Spiritually, it makes you invisible and slowly corrupts your soul, which is a lot of baggage for 21 grams.
Measurements
Mass2.1 hundredths kg
269 billionthsSpace Shuttle orbiters
9.3 thousandthsBags of flour
256 trillionthsWashington Monuments
Consistent with a solid gold ring of this size
Melting point (estimated)1,373 K
4.39Hot baths
6.9 tenthsBlast furnace cores
4.12Hot cocoa cups
Approximately 1100 degrees Celsius, the temperature of Mount Doom's forge