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Conduction, Convection, Radiation and the Greenhouse Effect

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Aditya Tirumalai

on 9 September 2015

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Transcript of Conduction, Convection, Radiation and the Greenhouse Effect

Thermal Radiation is the transfer of energy throug electromagnetic radiation.
Thermal Radiation
The Greenhouse Effect
Thermal Conduction
The greenhouse effect is a phenomenon in which gases like Methane, Carbon Dioxide and Water Vapor in the atmosphere trap energy within the Earth system, increasing the average temperature.

Gases present in the majority like Oxygen and Nitrogen are tightly bound so they don't absorb energy from sunlight and don't contribute much to the Greenhouse effect. The 1% of atmosphere made up by CO2, CH4, etc. has a much greater effect on the Greenhouse effect.
Convection is the movement of groups of atoms and molecules within a liquid due to density variations.

Convection currents are ther reason why all the water heated on a saucepan eventually reaches a uniform temperature.
What causes thermal conduction?
Atomic Vibration
Free Electrons

Examples of Thermal Conduction:
A bucket of water boiling when a hot metal is put in it.
Burning your hand when you touch a hot stove.
Ice melting when you hold it.
Just like with electricity, metals are generally good conductors of heat.
The best conductors are gold and copper, with aluminum and brass the worst conductors.
Most poor electrical conductors like glass and certain plastics are also poor conductors of heat.
Similarities between electrical and thermal conductors
Sea Breezes
Convection in the Earth
Examples of Convection Currents
Why Greenhouse gases absorb energy
Conduction, Convection, Radiation and the Greenhouse Effect
Full transcript