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,
Whole Wheat Bread. Whole wheat bread, and other breads made from 100 percent whole wheat grains are another good source for healthy carbohydrates. Unlike white bread, whole wheat bread still contains the bran and germ of the grains, which is where a majority of the nutrients in bread can be found. Simple carbohydrates are mainly made up of sugars like table sugar, fruit sugar or corn sugar. 2  Complex carbohydrates are foods made up of three or more linked sugars like bran, potatoes, brown rice, peas and whole grain cereals. 3  They are broken down and are turned into glucose to be used as a source of energy for cells.