What is the difference between heat and radiation?

I am trying to understand the difference between the words heat and radiation. Is radiation, like heat, something that you can feel? Heat is measured in degrees and radiation is measured in rads. I keep hearing stories about the radiation that cell phones put out. My cell phone gets warmer the longer I use it. Is it radiation that I am feeling?What is the difference between heat and radiation?
Radiation is energy given off in waves, like gamma radiation or microwave radiation. What we perceive as "heat" is only radiation in a certain wavelength range (infrared radiation).



Maybe your cell phone gets warmer while you use it because you're holding it in your hand?? Or, it probably gets warmer because the electronics in it operate by a transfer of electrons, whose friction generate heat; this is why computers need to be kept cool.What is the difference between heat and radiation?
Heat needs a medium to move through, radiation can travel through a vacuum. Your cell phone is a medium for hear to move through, you are not being affected by radiation.What is the difference between heat and radiation?
Heat is a form of energy. Radiation is a means by which energy is transmitted.