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.
Unripe plantains are green in color and go well with savory dishes. As the plantain ripens, it takes on a yellow color, and the taste becomes sweeter. One cup of raw plantain contains 181 calories, while 1 cup of fried plantains contains 365 calories. Try boiling or baking if you're worried about the number of calories. If you're having plantains as a snack, eat a one-half cup serving.