Radiation
What is radiation?
Radiation is the transfer of energy through space without particles of matter colliding or moving to transfer the radiation. This radiated energy warms an object when it is absorbed. Radiant heat energy moves from an area of higher temperature to an area of cooler temperature Source: http://ed.sc.gov/agency/ccr/Standards-Learning/documents/2014Grade6_SupportDoc.pdf
|
Source: http://www.bbc.co.uk/bitesize/standard/physics/energy_matters/
heat_in_the_home/revision/1/ |
Source: http://physics.stackexchange.com/questions/23048/what-exactly-is-the-difference-between-radiation-and-convection
|
How does heat travel through space?
Unlike conduction and convection, radiation involves waves instead of particles. This allows heat radiation to move through vacuums. Vacuums are areas with very little matter, like outer space. Since radiation does not require particles to transfer heat energy, the heat from the sun can radiate to the Earth through outer space. |
Let's see it in action!
Below is a video that shows heat transfer through radiation. As you watch the video, think about how heat transfers from the sun to the earth through radiation.
Below is a video that shows heat transfer through radiation. As you watch the video, think about how heat transfers from the sun to the earth through radiation.
Source: https://www.youtube.com/watch?v=3nX2Lee5MwY
What types of materials are best at absorbing radiated heat energy? Why might it be important to know this information?