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How big is 625 perches?

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It's about one-fifth as big as a Hot Air Balloon.
In other words, the size of a Hot Air Balloon is 5 times 625 perches.
(four-person capacity; envelope volume; average)
The average volume of a hot air balloon sufficient to lift four adults is 3,100 perches. Typically made of nylon or dacron, a balloon envelope of this size typically weighs just 88 kg (190 lbs).
It's about one-fifth as big as an Olympic Swimming Pool.
In other words, 625 perches is 0.18 times the size of an Olympic Swimming Pool, and the size of an Olympic Swimming Pool is 5.6 times that amount.
(FINA regulation; (minimum capacity)
According to the Fédération Internationale de Natation (FINA), a swimming pool for Olympic and world championship events must measure 50 m by 25 m with a depth of at least 2 m for a total volume of 3,600 perches. A pool of this size was to be used in Olympic time trials in New Jersey in early 2008, but its component pieces were stolen from a warehouse, likely to be sold for scrap metal.
It's about one-fifteenth as big as The Goodyear Blimp.
In other words, the size of The Goodyear Blimp is 13.1 times 625 perches.
(for GZ-20A) The Goodyear GZ-20 model Blimp measures 8,190 perches in total volume. A December, 1929 college football game between the University of Florida Gators and the University of Oregon Webfoots (later the University of Oregon Ducks) began with the blimp dropping a parachute-equipped ball from a height of 61 m (200 ft) to the field below.
It's about 40 times as big as a Concrete Mixer Truck.
In other words, the size of a Concrete Mixer Truck is 0.025 times 625 perches.
(a.k.a. cement mixer, a.k.a. cement mixer truck, a.k.a. cement transport truck, a.k.a. concrete mixer, a.k.a. concrete transport truck, a.k.a. in-transit mixer)(standard size; drum capacity)
A concrete mixer truck has a drum volume of up to 16 perches. Concrete mixer trucks can be in transit for about 90 minutes before the concrete dries — if the concrete dries while in the drum, jackhammers or even dynamite must be used to remove it.
It's about one-sixtieth as big as The Lincoln Memorial Reflecting Pool.
In other words, 625 perches is 0.0171 times the size of The Lincoln Memorial Reflecting Pool, and the size of The Lincoln Memorial Reflecting Pool is 58.5 times that amount.
(Washington, D.C.)
The Lincoln Memorial Reflecting Pool holds approximately 36,400 perches of water. The Pool has a sloping bottom and extends to 80 cm (30 in) deep in its center.
It's about one-eighty-fifth as big as The Capitol Rotunda (US).
In other words, the size of The Capitol Rotunda (US) is 83 times 625 perches.
(formally United States Capitol rotunda) (Washington, D. C.) (total chamber volume)
The Capitol rotunda measures 53,000 perches in total volume. Beneath the Capitol lies a crypt that was built to hold the remains of President George Washington, but according to his wishes, Washington was entered at his family home and the crypt remains empty.
It's about one-one-hundred-fiftieth as big as Spaceship Earth (EPCOT Center).
In other words, the size of Spaceship Earth (EPCOT Center) is 140 times 625 perches.
(a.k.a. EPCOT Center) (Walt Disney World Resort, Lake Buena Vista and Bay Lake, Florida) (total structure volume)
Spaceship Earth, the iconic structure at the heart of Walt Disney World Resort's Epcot (formerly EPCOT Center), has a total volume of 88,000 perches. The outer structure of the sphere features a gutter system that channels all rainwater into nearby World Showcase Lagoon instead of simply falling off the surface of the sphere.