It's about two-and-a-half times as heavy as an Anchor of a Cruise Ship.
In other words, 689 firkins is 2.49 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 0.402 times that amount.(for QE2 forward anchor, a.k.a. RMS Queen Elizabeth 2)
Each of the forward anchors of the RMS Queen Elizabeth 2 weighs 277 firkins. The anchor of the QE2 now sits in front of the Holyrood Church in Southampton, England, United Kingdom, along a pedestrian tourist route known as "the QE2 mile."
It's about two-fifths as heavy as The Space Shuttle.
In other words, the weight of The Space Shuttle is 2.5 times 689 firkins.(for Endeavour, a.k.a. OV-105, a.k.a. Orbiter Vehicle-105) (empty weight, excluding main engines)
When empty, the space shuttle Endeavour weighs 1,700 firkins. The shuttle's spacious cargo bay carried the Chandra X-ray Observatory into orbit in 1999 — a payload that weighed 480 firkins.
It's about one-fourth as heavy as a Blue Whale.
In other words, 689 firkins is 0.269 times the weight of a Blue Whale, and the weight of a Blue Whale is 3.72 times that amount.(Balaenoptera musculus)
Blue whales weigh between 2,560 firkins. The largest mammal to have ever lived, blue whales feed almost exclusively on krill — tiny invertebrates weighing about 0.0000245 firkins each.
It's about three-and-a-half times as heavy as an Elephant.
In other words, 689 firkins is 3.743 times the weight of an Elephant, and the weight of an Elephant is 0.2672 times that amount.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs between 184.1 firkins. Among African elephants, both males and females have tusks (female Asian elephants lack tusks) which can grow to 3 m (10 ft) and weigh up to 2.205 firkins.
It's about four-and-a-half times as heavy as a Tyrannosaurus rex.
In other words, the weight of a Tyrannosaurus rex is 0.23 times 689 firkins.(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 160 firkins while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.
It's about one-fifth as heavy as a House.
In other words, 689 firkins is 0.18 times the weight of a House, and the weight of a House is 5.56 times that amount.(149 sq. m, single-level, unfurnished)
A 149 sq. m (1,600 sq. ft), single-story, unfurnished house (without extensive masonry) of the type commonly found in America would weigh approximately 3,820 firkins, based on the weight of the included materials. In contrast, a yurt — a type of dwelling structure popular among nomadic peoples of East Asia — typically weighs less than 11.3 firkins.
It's about seven-and-a-half times as heavy as a Hippopotamus.
In other words, the weight of a Hippopotamus is 0.133 times 689 firkins.(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 91.9 firkins. Appearances to the contrary, adult hippos cannot swim or float in water; they actually move by leaping and walking across lake bottoms at about 8 kph (5 mph).