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Heat

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Transcript

  • 1. HEAT • TYPES OF THERMOMETERS • CONDUCTION • CONVECTION • RADIATION
  • 2. TYPES OF THERMOMETERS
  • 3. Alcohol Thermometer
  • 4. Electrical resistance thermometer
  • 5. Galileo thermometer
  • 6. Liquid Crystal Thermometer
  • 7. Mercury-in-glass thermometer
  • 8. Digital thermometer
  • 9. CONDUCTION
  • 10. CONDUCTION • What is conduction? • Well, heat is transferred in several different ways: conduction, convection, and radiation. Regardless of the method of transfer, only heat can be transferred because cold is the absence of heat. Conduction is the transfer of heat from one molecule to another through a substance. Not all substances conduct heat at the same speed. Metals and stone are considered good conductors since they can speedily transfer heat, but wood, paper, air, and cloth are poor heat conductors.
  • 11. CONVECTION
  • 12. CONVECTION • Convection is the concerted, collective movement of ensembles of molecules within fluids (i.e. liquids, gases) and rheids. Convection of mass cannot take place in solids, since neither bulk current flows nor significant diffusion can take place in solids. Diffusion of heat can take place in solids, but is referred to separately in that case as heat conduction.
  • 13. RADIATION
  • 14. RADIATION • In physics, radiation is a process in which energetic particles or energetic waves travel through a medium or space. Two types of radiation are commonly differentiated in the way they interact with normal chemical matter: ionizing and non-ionizing radiation. The word radiation is often colloquially used in reference to ionizing radiation (i.e., radiation having sufficient energy to ionize an atom), but the term radiation may correctly also refer to non-ionizing radiation (e.g., radio waves, heat or visible light). The particles or waves radiate (i.e., travel outward in all directions) from a source. This aspect leads to a system of measurements and physical units that are applicable to all types of radiation.
  • 15. BY: K.V.SAI SIDDHARTHA THANK YOU

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