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How big is 644.40 cubic feet?

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It's about one-and-seven-tenths times as big as a Concrete Mixer Truck.
In other words, the size of a Concrete Mixer Truck is 0.590 times 644.40 cubic feet.
(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 390 cubic feet. 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 thirty times as big as a Hot Tub.
In other words, 644.40 cubic feet is 25.40 times the size of a Hot Tub, and the size of a Hot Tub is 0.0394 times that amount.
(for Lifesmart Rock Solid Simplicity Plug and Play 4 Person Spa With 12 Jets) (a.k.a. Spa, a.k.a. Jacuzzi, a.k.a. Whirlpool) (Advertised Capacity)
An average, four-person hot tub holds 25.40 cubic feet of water. Modern hot tubs became popular outside of Japan starting in about 1940.
It's about 100 times as big as a Bathtub.
In other words, 644.40 cubic feet is 110 times the size of a Bathtub, and the size of a Bathtub is 0.0091 times that amount.
(a.k.a. bath, a.k.a. tub) (for Bootz Industries Aloha 5 ft. Left Hand Drain Soaking Tub)
The capacity of a typical bathtub is 5.70 cubic feet. Historically, bathtubs have been made of various materials including marble, terracotta, silver, gold, and iron but the size and shape of the tubs has changed little in their 7,000 year history.
It's about one-one-hundredth as big as a Hot Air Balloon.
In other words, 644.40 cubic feet is 0.0083 times the size of a Hot Air Balloon, and the size of a Hot Air Balloon is 120 times that amount.
(four-person capacity; envelope volume; average)
The average volume of a hot air balloon sufficient to lift four adults is 78,000 cubic feet. Typically made of nylon or dacron, a balloon envelope of this size typically weighs just 88 kg (190 lbs).
It's about one-one-hundred-fiftieth as big as an Olympic Swimming Pool.
In other words, the size of an Olympic Swimming Pool is 140 times 644.40 cubic feet.
(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 88,000 cubic feet. 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 250 times as big as a Car Gas Tank.
In other words, 644.40 cubic feet is 241 times the size of a Car Gas Tank, and the size of a Car Gas Tank is 0.00415 times that amount.
(for 2009 Ford Taurus)
A car gas tank (for example, that of a 2009 Ford Taurus) holds 2.670 cubic feet of gas. In contrast, the Curved Dash Oldsmobile — the first mass-produced car — had a fuel capacity of just 0.7060 cubic feet.
It's about 300 times as big as a Beer Keg.
In other words, 644.40 cubic feet is 311 times the size of a Beer Keg, and the size of a Beer Keg is 0.00322 times that amount.
(Half barrel; maximum capacity)
The most common keg size sold by US beer sellers is a half-barrel type with a volume of 2.07 cubic feet. This type of keg contains the equivalent of 165 0.0125 cubic feet cans of beer.