Convection

• Convection


  Where energetic particles move away from hotter to cooler regions
• Convection occurs only in liquids and gases
• Convection


  1. Energy is transferred by heating to the thermal store of the liquid or gas

  2. Particles move faster and the space between individual particles increases

  3. Warmer and less dense region will rise above denser cooler regions

  4. If there is a constant heat source, a convection current can be created
• Radiators create convection currents


  1. Energy is transferred from the radiator to the nearby air particles by conduction

  2. The air by the radiator becomes warmer and less dense as the particles move quicker

  3. The warm air rises and is replaced by cooler air

  4. The previously heated air transfers energy to the surroundings and becomes denser and sinks

  5. This cycle repeats, causing a flow of air to circulate around the room
• In convection


  Particles move from hotter regions to cooler regions
• In conduction, vibrating particles transfer energy to neighbouring particles
• Convection is different from conduction