(c) McGraw Hill Ryerson 2007 10.1 Temperature Thermal Energy, and Heat The kinetic molecular theory explains that all matter is made up of tiny particles.

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Presentation transcript:

(c) McGraw Hill Ryerson Temperature Thermal Energy, and Heat The kinetic molecular theory explains that all matter is made up of tiny particles.  These atoms and molecules are constantly in motion.  Kinetic energy is energy due to motion. The particles of a substance move differently for different states.  In solids, particles vibrate slightly, do not change position.  In liquids, particles vibrate more and move around within a set volume.  In gases, particles vibrate greatly and move around to take all volume available. See page 424 Solids, liquids and gases behave differently according to the kinetic molecular theory.

(c) McGraw Hill Ryerson 2007 Temperature, Thermal Energy and Heat Temperature is the average of the kinetic energy of the particles of a substance.  The movement of particles is what we measure as temperature.  Temperature is measured in degrees Fahrenheit, Celsius and/or Kelvin. Thermal energy is the total energy of all the particles in a substance.  Thermal energy = all kinetic energy + all potential energy  Kinetic energy is the energy of movement.  Potential energy is the energy of position = how much the particles vibrate, and therefore how much space they take up. Heat is the transfer of thermal energy  Heat flows from higher thermal energy to lower thermal energy See pages

(c) McGraw Hill Ryerson 2007 Thermal Energy Transfer Conduction is the transfer of thermal energy by direct contact.  Heat is transferred from high temperature, high kinetic energy particles to lower temperature, lower kinetic particles.  For example, a cold spoon warms when placed in a cup of hot coffee.  Thermal conductors transfer heat easily, while insulators do not. Convection is the transfer of heat energy in fluids (liquids and gases)  Convection is the movement of heat energy from hot to cold within a fluid, or the movement of hot liquid to an area of cool liquid.  Because there is a density difference, warm fluid (low density) moves to cold.  This is how convection currents form. Radiation is the transfer of radiant energy by waves.  What we feel as heat is generally called infrared radiation.  Earth’s interior thermal energy comes from the core, plus some radioactive element decay. See pages Take the Section 10.1 Quiz