Thermoplastics can be melted and reshaped over and over again, while thermosetting plastics can only be heated and shaped once. Items made from thermoplastics can easily deform when they are exposed to heat, while those that are made of thermosetting plastics cannot.Know More
All plastics are categorized into either thermoplastics or thermosetting plastics. Unlike thermoplastics, thermosetting polymers form bonds that are not reversible during the curing process. As thermoset plastics can withstand heat, they are used in the manufacture of the handles and lid knobs of cooking pots and in electrical insulation. The items are hard, stiff and resist chemicals.
On the other hand, thermoplastics are used to manufacture kitchen equipment, such as cups, jugs, containers, bottles and plastic spoons. In addition, they make simple home tools and implements, such as piping, wash basins, combs and toys. Thermoplastics can be further categorized into nylon, acrylic, polypropylene, polystyrene, low-density polythene and high-density polythene. The six categories of plastics have different properties of color, degree of malleability and weight.
Similarly, thermoset plastics can be categorized into different types: epoxy resin, melamine formaldehyde, polyester resin and urea formaldehyde. These categories of thermosetting plastics have varying degrees of stiffness, textures and levels of resistance to chemicals.Learn more about Thermodynamics
Fresh snow has the Earth's highest albedo at 0.95. Albedo is a measure of reflectivity. Fresh snow reflects approximately 95 percent of the sun's rays.Full Answer >
Thermal insulation can be defined as the material or a combination of materials that retard the transfer of heat. Heat may be transmitted between materials by the process of convection, conduction or radiation. Insulators reduce the flow of heat.Full Answer >
A quasi-equilibrium refers to a quasi-equilibrium process in thermodynamics, which is a process in which the system only deviates from equilibrium by infinitesimal amounts. Quasi-equilibrium processes can be used to closely approximate real processes.Full Answer >
Entropy is the measure of the disorder prevalent in a dynamic system. Entropy is defined by the second law of thermodynamics as the amount of thermal energy flowing in and out of a system. It is a measure of the randomness or chaos prevalent in a system.Full Answer >