1. Radiation
By Bao Tran

2. Radiation – definition
Radiation is a process of heat transfer in which heat is directly passed from one body to the other body without affecting the medium.

3. Radiation
Unlike conduction and convection, radiation does not need particles at all.
Radiation can travel through an empty space or a vacuum. This property of radiation is clearly shown by the radiation that arrives from the Sun.
Radiated heat is carried by infrared radiation, which is an important part of the electromagnetic spectrum.

5. Radiation
All objects take in and give out infrared radiation all the tim.
Hot objects have more heat thus radiate more infrared than cold objects.
The amount of radiation given out or absorbed by an object is manly depended on its temperature or surface.

7. Radiation – SI Units
Units of Radiation are confusing. When you start reading the news/literature/blogs, there are what seems like a billion different units to explain radiation. However, these are the main units that you would find casually (SI units first).
Becquerel[Bq] or Curie[Ci]: radiation emitted from a radioactive material  (1 Ci = 3.7 × 1010 Bq)
Gray [Gy] or Rad[rad]: radiation absorbed by another material (1Gy = 100 rad)
Sieverts[Sv]* or “roentgen equivalent in man”[rem]: how badly radiation will damage biological tissue (1 Sv = 100 rem)

9. Thank you!