$25.$ Characterization of materials involves analyzing their properties and microstructure to understand their behavior. $($True$/$False$)26.$ Diffusivity is a measure of the resistance of a material to the diffusion of atoms or molecules. $($False$/$True$)27.$ Activation energy is the energy required to activate a diffusion process and is independent of temperature. $($False$/$True$)28.$ Ficks Law of diffusion applies only to gases and liquids and not to solids. $($False$/$True$)$