Convection is of two types: natural and forced. Heated air rising is an example of natural convection. Hot air has a lower density than that of the cooler air in the atmosphere above it and therefore is buoyant; as it rises, however, it loses energy and cools.
Your best good carbs sources are from this healthy carbohydrates list: 1  Raw and lightly steamed vegetables, 2  Legumes, beans, nuts and seeds, 3  High fiber 100% whole grains,4  Raw, whole, fresh fruits, 5  Most low fat dairy.our best good carbs sources are from this healthy carbohydrates list: 1  Raw and lightly steamed vegetables, 2  Legumes, beans, nuts and seeds, 3  High fiber 100% whole grains,
Excellent Sources of Complex Carbohydrates. Complex carbohydrate foods are basically those in wholegrain form such as wholegrain breads, oats, muesli and brown rice.Complex carbs are broken down into glucose more slowly than simple carbohydrates and thus provide a gradual steady stream of energy throughout the day.roducts that contain a large portion of these staple ingredients are usually a good high complex carbohydrate source, see the second list. Still, the best way to provide your diet with complex carbohydrates is to consume foods in their most natural state such as oatmeal, bran and brown rice.