Heat Energy


Description:

The processes that take place when heat is added to a material (solid, liquid, or gas) or removed from it, the concepts of measuring temperature changes and amounts of heat

Learning Outcome:

Upon completion of this module you will be able to:

  1. Define and give one example of sensible and latent heat.
  2. Identify the physical changes that occur when matter changes state from solid to liquid to gas.
  3. Explain the methods of measuring the intensity and quantity of heat.
  4. Define "Specific heat".
  5. Explain the methods of measuring the heat required to raise a material to a higher temperature.
  6. State the latent heat of fusion for ice and the latent heat of vaporization for water.
  7. Explain the methods of measuring the heat released by a material when it cools.
  8. List three types of energy (in addition to heat energy) and give an example of each.
  9. Explain how energy can be changed from one form to another.

Topic 1: Sensible and Latent Heat

  • Topic Introduction and Objectives
  • Sensible Heat of a Solid
  • Melting (Fusion)
  • Latent Heat of Fusion: Changing Solid to Liquid
  • Latent Heat of Fusion: Motion of Molecules in Liquid State
  • Latent Heat of Fusion: Latent Heat of Water and Other Materials
  • Sensible Heat of a Liquid
  • Check-Point Question: Sensible Heat of a Solid
  • Evaporation
  • Evaporation: An Example
  • Sublimation
  • Boiling Point
  • Boiling (Vaporization)
  • Latent Heat of Vaporization
  • Sensible Heat of a Vapor
  • Check-Point Question: Evaporation, Boiling and Sublimation
  • Topic Summary

Topic 2: Changes of State

  • Topic Introduction and Objectives
  • When Gas Changes State
  • Changing Water Vapor to Liquid Water
  • Changing Water to Ice
  • Total Heat
  • Total Heat of Water at 65° F Total Heat of Steam at 400° F
  • Check-Point Question: Changes of State
  • Topic Summary

Topic 3: Measuring the Amount of Heat Energy

  • Topic Introduction and Objectives
  • Knowing How to Measure Heat Energy
  • British Thermal Unit (Btu)
  • Calculating the Amount of Heat Energy in Btu
  • The Effect of Adding Heat Energy to Materials
  • Amount of Heat Required to Raise the Temperature of Materials
  • Amount of Heat Required to Raise the Temperature of Gases
  • Specific Heat
  • Check-Point Question: Measuring the Amount of Heat Energy
  • Topic Summary

Topic 4: Adding Heat

  • Topic Introduction and Objectives
  • Raising a Material to a Higher Temperature: An Example
  • Latent Heat of Fusion: Changing Ice to Water
  • Sensible Heat: Heating Water to Boiling Point
  • Latent Heat of Vaporization: Changing Water to Water Vapor
  • Superheated Steam
  • Summary of Process
  • Check-Point Question: Adding Heat
  • Check-Point Question: Summary of Processes
  • Topic Summary

Topic 5: Removing Heat

  • Topic Introduction and Objective
  • Removing Heat, or Cooling
  • Changing a Liquid to Gas and Gas to Liquid
  • Changes in States due to Changes in Latent Heat
  • Summary of Process
  • Check-Point Question: Removing Heat
  • Check-Point Question: Removing Heat
  • Topic Summary

Topic 6: Conservation of Energy

  • Topic Introduction and Objectives
  • Types of Energy
  • Law of Conservation of EnergyCheck-Point Question: Types and Conservation of Energy
  • Topic Summary