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,
Fruits are a good source of carbohydrates, says the U.S. Department of Health and Human Services. The sugars found in fruits are naturally occurring, as opposed to refined sugars in sweets and baked goods. Choose whole fruits rather than fruit juice.Use fruits that are frozen or canned in their own juice rather than syrup. Serve fruit with lunch, and have a piece of fruit for a snack. Fruits high in fiber such as apples at 19 g, oranges at 15 g and raw pineapple at 19 g of carbohydrates are good choices.rains. Grains are an important source of carbohydrates, as they contain healthy fiber. Whole grains have undergone little processing, making these grains a low-glycemic food. According to the Harvard School of Public Health, carbohydrates with a low-glycemic index can help control blood sugar.