It's about one-and-nine-tenths times as big as a Concrete Mixer Truck.
In other words, the size of a Concrete Mixer Truck is 0.530 times 181 barrels.(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 95 barrels. 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, 181 barrels is 29.10 times the size of a Hot Tub, and the size of a Hot Tub is 0.0344 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 6.220 barrels of water. Modern hot tubs became popular outside of Japan starting in about 1940.
It's about one-one-hundredth as big as a Hot Air Balloon.
In other words, 181 barrels is 0.0095 times the size of a Hot Air Balloon, and the size of a Hot Air Balloon is 110 times that amount.(four-person capacity; envelope volume; average)
The average volume of a hot air balloon sufficient to lift four adults is 19,000 barrels. Typically made of nylon or dacron, a balloon envelope of this size typically weighs just 88 kg (190 lbs).
It's about one-one-hundredth as big as an Olympic Swimming Pool.
In other words, 181 barrels is 0.0084 times the size of an Olympic Swimming Pool, and the size of an Olympic Swimming Pool is 120 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 22,000 barrels. 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 150 times as big as a Bathtub.
In other words, the size of a Bathtub is 0.0077 times 181 barrels.(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 1.40 barrels. 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-two-hundred-fiftieth as big as The Goodyear Blimp.
In other words, 181 barrels is 0.00365 times the size of The Goodyear Blimp, and the size of The Goodyear Blimp is 274 times that amount.(for GZ-20A) The Goodyear GZ-20 model Blimp measures 49,600 barrels 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 300 times as big as a Car Gas Tank.
In other words, 181 barrels is 276 times the size of a Car Gas Tank, and the size of a Car Gas Tank is 0.00362 times that amount.(for 2009 Ford Taurus)
A car gas tank (for example, that of a 2009 Ford Taurus) holds 0.6550 barrels of gas. In contrast, the Curved Dash Oldsmobile — the first mass-produced car — had a fuel capacity of just 0.1730 barrels.