It's about 850,000 times as heavy as a Nail
It's about 0.0000009 times as heavy as The Golden Gate Bridge
In other words, 680 kilograms is 0.0000008450 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 1,180,000 times that amount.(San Francisco, California and Marin County, California) (Post 1986 weight reduction; total weight of bridge, anchorage, and approaches)
Following the completion of the 1986 project to eliminate excess material, the total weight of the Golden Gate Bridge — including its anchorages and approaches — is 805,000,000 kilograms. The two main cables in the spanning the bridge are spun out of a total of 129,000 km (80,200 mi) of wire.
It's about 3,000,000 times as heavy as a Raindrop
In other words, the weight of a Raindrop is 0.000000300 times 680 kilograms.(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 0.0002 kilograms. The familiar teardrop shape of a raindrop is actually an optical illusion, caused by the reflection of the light and the motion of the drop.
It's about 0.0000001 times as heavy as The Great Pyramid of Giza
In other words, 680 kilograms is 0.000000120 times the weight of The Great Pyramid of Giza, and the weight of The Great Pyramid of Giza is 8,300,000 times that amount.(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt)
The Great Pyramid of Giza has an estimated mass of 5,900,000,000 kilograms. The 2,300,000 stones used in the construction of the pyramid weighed an average 2,300 kilograms and were quarried from distances of up to 805 km (500 mi) away.
It's about 25,000,000 times as heavy as a Grain of Rice
In other words, the weight of a Grain of Rice is 0.0000000430 times 680 kilograms.(long grain; 14% moisture content)
A single long grain of rice weighs an average of 0.0000290 kilograms. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.
It's about 150,000,000 times as heavy as a Grain of Sand
In other words, the weight of a Grain of Sand is 0.00000000670 times 680 kilograms.(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.00000440 kilograms. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.
It's about 200,000,000 times as heavy as a Sesame Seed
In other words, 680 kilograms is 187,000,000 times the weight of a Sesame Seed, and the weight of a Sesame Seed is 0.000000005350 times that amount.(Sesamum indicum)
A sesame seed weighs approximately 0.000003640 kilograms. The McDonald's Big Mac sandwich, which is well-known for its sesame seed top bun, accounts for the consumption of an estimated 2,009.32 kg of sesame seeds each day.