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.
How many carbs in a banana + calories (raw): Sliced (1 cup, 150 grams): 134 calories, 34.2 carbohydrates; Mashed (1 cup, 225 grams): 200 calories, 51.3 carbohydrates; How many carbs in a plantain + calories (cooked): Sliced (1 cup, 154 grams): 179 calories, 48 carbohydrates; Mashed (1 cup, 200 grams): 232 calories, 62.3 carbohydrates