Fungibles is defined as products that contain many similar parts such as a barrel of nuts or beer, and which can be very easily replaced by different similar goods. If the products are sold by its weight or by the amount, this is an almost sure indication that these products are fungible.
Goods, securities or instruments that are equivalent and, therefore, interchangeable. In other words, they are goods that consist of many identical parts which can be easily replaced by other, identical goods. If the goods are sold by weight or number, this is a good sign that they are fungible.
Duhaime Legal Dictionary
Goods which are comprised of many identical parts such as a bushel of grain or a barrel of apples or oil, and which can be easily replaced by other, identical goods.
Fruit or food products are examples of fungibles because they can be exchanged indifferently between one and another. Salt and gasoline are other examples.
Thus, if the goods are sold by weight or number, this is a good sign that they are fungible.
n. sometimes merely called "fungibles," goods which are interchangeable, often sold or delivered in bulk, since any one of them is as good as another. Grain or gravel are fungibles, as are securities which are identical.