Smaller dice sizes cook faster than larger dice sizes because they have a greater surface area exposed to heat. This increased surface area allows for quicker heat transfer and thus, faster cooking.
The size of a dice, or the cut of an ingredient, significantly impacts its cooking time. This is primarily due to the relationship between surface area and volume. When you dice an ingredient into smaller pieces, you are essentially increasing its surface area relative to its volume. This means more of the ingredient is directly exposed to the heat of the cooking environment, whether it's a pan, oven, or pot of boiling water.
Consider a large potato versus a potato diced into small cubes. The large potato has a smaller surface area compared to its overall volume. Heat must penetrate through the entire potato to cook it evenly. The small potato cubes, however, have a much larger surface area exposed to the heat. This allows the heat to penetrate more quickly and evenly, resulting in a faster cooking time.
Therefore, if you need an ingredient to cook quickly, dicing it into smaller pieces is an effective strategy. Conversely, if you want an ingredient to retain its texture and cook more slowly, larger dice sizes are preferable. This principle applies to various cooking methods, including sautéing, roasting, boiling, and braising.
For even cooking, ensure all the pieces in your dice are as uniform in size as possible. Inconsistent dice sizes will lead to some pieces being overcooked while others are undercooked.