Plastics are used in almost all spheres of life for diverse purposes because of their beneficial properties. The uses of plastics include the following:
1. Plastics are used in the manufacturing of various items that we use in our homes such as television, phones, radio, vacuum cleaners, chairs, bowls plates, tables, etc.
2. Plastics are used in the food industry for packaging of foods.
3. Plastics are used in the transport industry for various purposes in the manufacture of cars, trains, aeroplanes, hydroplanes, ships, satellites, etc.
4. Plastics are also used in the medical and pharmaceutical industries for various purposes.
Manufacturers are able to use plastics for various purpose because of their properties, which include: resistance to corrosion, resistance to chemicals, low thermal conductivity, color variability, high strength to weight ratio, resistance to shock, durability, low toxicity, ready availability, cheap, etc.
B- greater thermal conductivity
C- greater thermal insulation
D- a higher R-value
Answer: The correct answer is "greater thermal conductivity".
Explanation:
Thermal conductivity: It is a ability to conduct heat. Heat transfers occur at a lower rate to material at higher thermal conductivity.
It is defined as the rate at which the heat is transferred through a unit thickness of the substance per area per change in the temperature.
In the given problem, A piece of wood and a piece of steel are at the same temperature. However, the steel feels hotter. The thermal conductivity of the steel is more than the thermal conductivity of the wood.
Therefore, the correct option is "greater thermal conductivity".
B- Greater thermal conductivity