Fluidity refers to the ability of a substance to flow easily and change shape without a fixed structure. This property is commonly associated with liquids, such as water or oil, which can take the shape of their containers. In physics, fluidity is an important concept that helps explain how fluids behave under different conditions, including pressure and temperature. In a broader context, fluidity can also describe the adaptability of ideas, identities, or social roles. For example, in discussions about gender, gender fluidity refers to the changing nature of one's gender identity over time. This concept emphasizes that identities are not always fixed and can evolve based on personal experiences and societal influences.