Convection Currents, Convection Currents-Examples, Boiling of Water (For CBSE, ICSE, IAS, NET, NRA 2022)

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Convection Currents

It is a process which involves the movement of energy from one place to another, also called to as convection heat transfer.

Convection Currents

Convection Currents
  • These currents tend to move a fluid or gas particles from one place to another.
  • These are created as a result of the differences occurring within the densities and temperature of a specific gas or a fluid.
  • Convection is one among the forms of heat transfers, of which the other two are radiation and conduction.
  • Convection process only happens in the fluids i.e.. , in liquids and gases.
  • This happens due to the reason that molecules within liquids or gases are free to move.
  • The heat energy can be transferred by the process of convection by the difference occurring in temperature between the two parts of the fluid.
  • Due to this temperature difference, the hot fluids tend to rise, whereas cold fluids tend to sink.
  • This creates a current within the fluid called as Convection current.
  • The mantle within the earthีšs surface flows due to convection currents.
  • These currents are caused by a very hot material present in the deepest part of the mantle which rises upwards, then cools, sinks, again and again, repeating the same process of heating and rising.
  • So, Convection Current is defined as โ€œa process of continuous heating up of liquids or gases by the process called as Convection.โ€

Convection Currents- Examples

Boiling of Water

  • When boiling water on stove or while making tea or while boiling an egg.
  • The temperature of molecules within those liquids increases and they slowly begin to move in a rapid rate.
  • These molecules get charged up thus producing kinetic energy. This hot water molecules residing near to heat source tend to become less dense. They rise above cooler dense molecules.
  • If these hotter molecules rise, they tend to cool down and begin to sink replacing cooler molecules.
  • These movements occurring within this boiling water what the convection currents.

Campfires

  • The hotness which one feels around a campfire is all that convection currents heating up the hand.
  • The heat comes from various kinds of heat transfers such as radiation.

Changes in the Weather

  • The cool air and breeze occurring near to a beach are all the effects of convection currents.
  • The weather changes daily are also affected by these currents.

Convection Currents Occurring in the Ocean

  • The Oceanic currents are also the convection currents.
  • Due to the difference in the water density and the temperature occurring in different parts of the ocean.

Convection currents are present in the air

  • Warm air is the best examples that rise towards the ceiling in your house.
  • The process happens as the warm air is said to be less dense than that of the colder air.
  • The wind is mainly caused when the reflected radiation of the light from the sun heats up the air, thus displacing the cooler air.

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