Molecules oscillates in a regular lattice arrangement. Highest kinetic kinetic energy of molecules High intermolecular distance (typical˜3 nm) Low intermolecular distance (typical˜0.3 nm) When the liquid vaporizes and turns into the gas phase, the density drastically drops as the molecules starts to move freely between the intermolecular collisions. However, the density of liquids and solids, in other words the mean molecular distances at these two phases do not differ much from each other. The molecules gain kinetic energy as a result of added heat and start to move around in an irregular pattern. by heating it, the matter melts and consequently becomes a liquid. When enough energy is given to the molecules, e.g. At this state, there is a strong attraction between the molecules and kinetic energy of the molecules can not overcome this force in this phase of the matter. In a solid, molecules form a regular lattice and oscillate around an equilibrium point. As the distance between the molecules or the mean free path of the flowing medium approaches to the characteristic size of the flow device, the flow cannot be treated as continuum. ![]() Depending on the phase of the fluid (gas,liquid or supercritical), the distance between the molecules shows orders of magnitude difference, being the largest in the gas phase and shortest in the liquid phase. Solids, Liquids and Gases Ī fluid is composed of atoms and molecules.
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