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 green plantain is very low in sugar. The carbohydrate in the green unripe plantain is stored as a complex starch, slowly released after cooking and it is a good inclusion in a diabetic diet. The ripe or yellow plantain is rich in sugar and very sweet to taste. A diet of green plantain is filling, and can also be a good inclusion in a weight loss diet plan. No wonder the nutritional value of plantain is unsurpassed.