Final answer:
Another term for 'energy dense' is 'high energy density,' which measures energy concentration in a substance by unit mass. Carbohydrates and proteins have moderate energy density, while fats are more energy-dense. Hydrogen gas is extremely energy-dense when compared to other substances.
Step-by-step explanation:
Another term for energy dense is high energy density. This term refers to how concentrated energy is in a substance, quantified as energy per unit mass. In the context of chemistry, substances with around 10 kcal/g or higher are considered high in energy density, while those with about 1 kcal/g or lower are seen as having low energy density. For instance, carbohydrates and proteins typically have an energy density of around 4 kcal/g, fats have about 9 kcal/g, making them more energy-dense compared to the rest. In contrast, hydrogen gas is an example of a substance with a very high energy density, around 34 kcal/g, because hydrogen is a very light atom.
When discussing food, energy density refers to the number of Calories a food provides per unit of mass or volume. Understanding energy density is essential, particularly when considering the energy efficiency ratio of different fuels and food substances, which can impact both diet and fuel choice for various applications.