Interesting Math History

Question :
How did the word 'Ton' originate ? Why should there be 2000 pounds in a ton, and why not 1000?

Answer :
The word Ton originates from the word tub.
And a wine maker's tub which also known as tun traditionally fills 250. One gallon bottles of wine each weighing about 8 pounds.
Long Ton (called ton in countries such as the United Kingdom) is a weight ton or gross ton, and it equals to 2,240 pounds.
Short Ton (called ton in North America) it equals to 2,000 pounds.