👉 The IST-FLUID, or Interstitial Space Fluid, is a theoretical model describing the fluid dynamics within the microscopic voids and spaces between atoms in solid materials. Unlike the more familiar liquids and gases, this fluid is not composed of molecules but rather consists of quantum mechanical excitations or phonons—vibrations in the crystal lattice. The IST-FLUID model helps explain how heat and mass transport occur at the nanoscale, influencing properties like thermal conductivity and mechanical strength in materials. This concept is crucial for understanding and designing advanced materials, particularly in nanotechnology and semiconductor physics.
