👉 Physical fluids, also known as liquids or gases, are substances that exhibit both fluidity and compressibility. Unlike solids, which have a fixed shape and volume, fluids take the shape of their container but maintain a constant volume. Liquids are incompressible up to a certain point, meaning their density remains relatively constant regardless of pressure changes. Gases, on the other hand, are highly compressible and expand to fill their container, with their density varying significantly with pressure and temperature. Both liquids and gases flow due to differences in pressure and can exhibit phenomena like surface tension and viscosity, which are unique properties arising from their molecular interactions.
