Definite volume refers to something which has a consistent, unchanging volume, which in practical terms may mean a static mass and density, or a predetermined shape, either of which will dictate volume. A cube with side length l has a definite volume because it can only be exactly one size.
One cup of raw plantains or one medium sized raw plantain contains: ~180-200 calories, 0.5 g total fat, 47-50 g carbohydrates, 3.5 g dietary fiber, 22 g sugar and 2 g protein. Because of it's high carbohydrate content, you need to monitor your portion, otherwise your blood sugars will spike.
The plantain is a variety of banana popular in Latin American cuisine. Plantains are much larger than regular bananas and have firm, mild-flavored flesh. Plantains are often prepared like potatoes, however the most popular way to enjoy plantains is fried. A serving of fried plantains is 1 cup, which has 365 calories.