Ch14 S1and2

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This document discusses key concepts about temperature and heat transfer. It defines temperature as a measure of the average kinetic energy of particles. All matter is made of atoms or molecules that are always moving, with higher temperatures corresponding to faster average particle speeds. Thermometers measure temperature based on the property of thermal expansion. Common temperature scales are Celsius, Fahrenheit and Kelvin, with Kelvin being the official SI scale. Heat is the transfer of thermal energy between objects at different temperatures, occurring through conduction, convection or radiation until thermal equilibrium is reached.

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°C  K  273 K  °F K  °C  273 °C  K °F  °C °C  °F Use the equation To convert

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Heat is the thermal energy that flows from an object at higher temperature to an object at lower temperature. The transfer of heat energy from one object to the other is called transmission of heat. Heat energy transfers in three ways, 1. Conduction 2. Convection 3. Radiation Conduction If one end of a metal rod is heated with a flame, the other end will also get heated up after a while. The heat energy is transferred from one end of the rod to the other without the actual movement of particles (atoms or molecules) of the rod. Such a mode of transmission of heat is called conduction. The transfer of heat through matter without the actual movement of particles from their position is called conduction. Conduction occurs in solids, liquids and gases, but solids usually conduct heat better than liquids or gases. In solids, the particles are held very close to each other. They vibrate constantly. When we heat one part of a solid, the particles gain heat energy and start vibrating faster. During their vibration they collide nearby particles and also cause them to vibrate fast. In this way, the particles of hot part of a solid transfer heat to those in the colder parts. Good and Bad Conductors Different materials conduct heat at different rates. Materials which allow heat to flow through them easily are called good conductors of heat. Solids such as metals are good conductors of heat. Materials which do not allow heat to flow through them easily are called bad conductors of heat or heat insulators. Solids such as wood, glass, plastic, styrofoam, etc. are bad conductors of heat. All liquids (except mercury which is a liquid metal) and gases are also bad conductors of heat. Why metals are better conductors than non-metals? All solids (metals and non-metals) are made of tiny particles called molecules. But, some solids conduct heat better than others. Put a metal and a plastic spoon in hot water. Which one is a good conductor of heat, metal or plastic? When both spoons receive heat energy, the particles (atoms or molecules) at the hot end of each spoon vibrate fast and collide into neighbouring particles. These particles transfer heat energy to next neighboring particles. Particles in metals are packed more closely together than non-metals. Metals can transmit heat energy more readily than non-metals (wood, plastic, etc.). The presence of free electrons also speeds up the transfer of heat in metals. When the metal spoon gets heated, the free electrons gain kinetic energy and move farther towards the colder parts of the metal spoon. They collide the atoms in the colder parts and transfer heat energy to them. In metals, heat energy is transferred from one place to another both by the vibrations of particles as well as by the movement of free electrons. That is why metals are good conductors of heat than non-metals(insulators). Conduction in Liquids and Gases The process of conduction in liquids and gases is very slow as compared to solids.

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Ch14 S1and2

1. Chapter 14 Section 1 Temperature

10. °C  K  273 K  °F K  °C  273 °C  K °F  °C °C  °F Use the equation To convert

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Ch14 S1and2

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