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How big is 390 cubic feet?

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It's about as big as a Concrete Mixer Truck.
(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 fifteen-and-a-half times as big as a Hot Tub.
In other words, the size of a Hot Tub is 0.0649 times 390 cubic feet.
(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 25.4 cubic feet of water. Modern hot tubs became popular outside of Japan starting in about 1940.
It's about 70 times as big as a Bathtub.
In other words, 390 cubic feet is 69 times the size of a Bathtub, and the size of a Bathtub is 0.014 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 5.7 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 150 times as big as a Car Gas Tank.
In other words, 390 cubic feet is 146 times the size of a Car Gas Tank, and the size of a Car Gas Tank is 0.00685 times that amount.
(for 2009 Ford Taurus)
A car gas tank (for example, that of a 2009 Ford Taurus) holds 2.67 cubic feet of gas. In contrast, the Curved Dash Oldsmobile — the first mass-produced car — had a fuel capacity of just 0.706 cubic feet.
It's about 200 times as big as a Beer Keg.
In other words, 390 cubic feet is 188 times the size of a Beer Keg, and the size of a Beer Keg is 0.00532 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.
It's about one-two-hundredth as big as a Hot Air Balloon.
In other words, the size of a Hot Air Balloon is 200 times 390 cubic feet.
(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-two-hundred-fiftieth as big as an Olympic Swimming Pool.
In other words, the size of an Olympic Swimming Pool is 230 times 390 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.