Heat and Heat Transfer

• Heat is a thermal energy which flows from one body to another due to a temperature difference between them, it always flow from the hotter to cooler objects.
• Heat Transfer is the flow of heat within an object and from one object to another due to the differences in temperature.
• Conduction is a transfer of heat when two objects at different temperature are in direct contact with each other.
• Convection is a transfer of heat in fluids. It transferred to cooler regions by currents.
• Radiation is a transfer of heat of electromagnetic waves is an energy that travels through space.
• Conduction

  • Transfer of heat by touching
  • Occurs in solids
  • Transfer of heat from warmer part of an object to the cooler part of the same object.
• Convection

  • Occurs in liquids and gases
  • Transfer of heat through the movement of particles
  • Warm particles rise, cool particles fill in space below.
• Radiation

  • Transfer of energy as waves
  • Travels through matter or empty space.