Colorless substances are materials that do not have a distinct color. This means they appear transparent or clear, allowing light to pass through without significant scattering. Common examples include water, air, and certain gases like carbon dioxide. These substances can be found in various states, such as liquids, gases, or even solids that are transparent. In many cases, colorless substances can still have important properties, such as taste, smell, or density. For instance, while water is colorless, it is essential for life and has unique characteristics like high surface tension. Understanding colorless substances is crucial in fields like chemistry and environmental science.