Heat and electricity are forms of energy that flow from molecules to molecules in some materials. Some materials have the ability to allow heat and electricity to flow through them because they possess the property of thermal conductivity. Thermal Conductivity is the ability of a material to transmit heat. Most materials that possess these characteristics are made up of metals. Metals are solid materials with compact molecules that are hard, ductile (can be pulled out into long wires), and malleable (that can be hammered or rolled into flat sheets or other shapes). They can react with other substances and form new materials. Most metals are good thermal and electrical conductors. Direction: Below are pictures of objects from A to D. Study them carefully, then answer the items that follow. A B C D carpet iron rod steel gate metal spoon and fork Which object is being described in each number? _____1. It is hard and can be made into wires. _____2. It is hard and can be hammered into flat thin sheets. _____3. It can be heated without burning. _____4. It can develop rust when exposed to rain. _____5. It can be burned and produce heat. Answer the following questions. 1. Each material is in what state of matter? _______________________________ 2. Which objects allow heat and electricity to flow without burning? _____________ Activity 1- “What made me?”Science V 3 4 rd Quarter Week 2 3. Which objects have similar characteristics? _____________________________ 4. Which object has a different characteristic from the others? _________________ 5. What are the characteristics of materials that conduct heat and electricity? ________________________________________________________________
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Heat and electricity are forms of energy that flow from molecules to molecules in some materials. Some materials have the
Answer:
KEY POINTS
On a microscopic scale, conduction occurs as rapidly moving or vibrating atoms and molecules interact with neighboring particles, transferring some of their kinetic energy.
Conduction is the most significant form of heat transfer within a solid object or between solids in thermal contact.
Conduction is most significant in solids, and less though in liquids and gases, due to the space between molecules.
The rate of heat transfer by conduction is dependent on the temperature difference, the size of the area in contact, the thickness of the material, and the thermal properties of the material(s) in contact.
KEY TERMS
thermal conductivity: the measure of a material’s ability to conduct heat
Explanation:
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