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,
Carbohydrates include sugar, starch and fiber. Sugar and starch provide glucose, which is the source of energy the body prefers. Itâs also the only form of fuel used by your brain. Complex carbohydrates, such as beans, vegetables and fruits, are healthy carbohydrate sources because they combine starches with fiber.arbohydrates include sugar, starch and fiber. Sugar and starch provide glucose, which is the source of energy the body prefers. Itâs also the only form of fuel used by your brain. Complex carbohydrates, such as beans, vegetables and fruits, are healthy carbohydrate sources because they combine starches with fiber.