How big is 31.5 dunams?
It's about 0.000000003 times as big as Canada
The size of Canada is about 9,984,670,000 dunams.
Canada measures 9,984,670,000 dunams in total area. It is both the second-largest country in the world and one of the most-sparsely populated, in addition to having the longest coastline of any country in the world — 243,000 km (151,000 mi).
It's about 400,000,000 times as big as a Nailhead
The size of a Nailhead is about 0.000000077740 dunams.
(for 11-gauge wire nai)
An 11-gauge nailhead measures 0.000000077740 dunams. Nails have been used since ancient times; archaeologists have discovered Ancient Egyptian nails that are over 5,000 years old.
It's about 0.0000000002 times as big as The Land area of Earth
The size of The Land area of Earth is about 148,940,000,000 dunams.
The Earth has a land area of 148,940,000,000 dunams. Only an estimated one-eighth of this area — or 18,618,000,000 dunams — is inhabitable by humans, with uninhabitable terrain such as deserts and high mountains covering the rest.
It's about 45,000,000,000 times as big as a Ballpoint Pen Tip
The size of a Ballpoint Pen Tip is about 0.000000000700 dunams.
(a.k.a. Biro, a.k.a. ball pen, a.k.a. dot pen) (for medium tip)
The most common size of ballpoint pen — a medium-tip — measures 0.000000000700 dunams. A typical ballpoint pen can write more than 8,500 m (28,000 ft) before running out of ink.