A number of common substances are Tar Sand “Silly Putty”, Jello Modeling clay, Tooth paste, Wax, and Shaving cream. Explain and give examples.

We will start describing the properties of given materials, first by grouping them in correspondence with their common characteristics. Materials like Wax, Tar and Jello have common characteristics. They behave like solid materials under right pressure and temperature conditions, but after the temperature is raised enough (under certain pressure), each of the materials reaches it’s melting point and becomes a liquid. After melting, each material will have fluid behavior. The second group is consisted of Modeling clay and Silly Putty. Both materials in their regular state show fluid behavior (although this materials act like very viscous and dense fitids). Due to oxidation susceptibility of the material structure, both materials will react with air if left to dry, and permanent changes in their chemical structure will tun them into solids. Shaving cream and Toothpaste aremembers ofthe third group. This materials can be categorized as solids, only if small intensity forces are acting on them, under standard atmospheric conditions. In other cases, this materials behave like highly viscous fluids. Sand is separate from all of the mentioned materials, due to it’s dual nature. Sand behaves very closely to a standard fluid, but sand itself is not in liquid state. Sand represents a structure made of many small crystal particles, which are all in solid state.