So that it cooks evenly without burning.
One major benefit of a heat exchanger is that it quickly transfers heat from one medium to another such as an air conditioning unit or a space heater.
With heat...
Not usually, but it should be heated. You can just put it in a saucepan on a medium heat until it gets to your desired temperature. Unless it specifies on the label, you most likely will not need to cook canned pork and beans.
I like to start on medium high to brown outside (1-2 minutes per side), then finish on medium low to desired level of how you wish your burger cooked. After browning, it also works well to remove to a baking sheet and finish in the oven at 300 degrees. With either method, keep a close eye on internal temperature to achieve desired finish of the cooked burger. (125 = medium-rare, 130 = medium, 135 = medium-well).
Meatballs are first form in your hands by rolling them from hamburger meat into balls and then placed in a skillet on medium heat and fried until they are done. You then place them in the sauce you are using and heated until ready to serve.
Infrared radiations. They do not require any medium. So they don't heat any medium. They don't even heat the air through which they pass.
Heat transfer by means of radiation doesn't heat the medium. In fact, radiation doesn't even require a medium in order to work. Strictly speaking, convection doesn't heat the medium either. Convection transfers heat by moving the medium around. Of course, heat also spreads throughout the medium by conduction while the convection is going on.
A simple risotto dish is very easy to make. First of all you heat up a stock and add olive oil, butter, onions, garlic, and celery and fry until the vegetables have softened, then add rice. After a minute it will look slightly translucent then add wine or vermouth and keep stirring. Once the alcohol has cooked into the rice start adding a ladle of stock. Turn down heat and keep adding a ladle of stock waiting until it is absorbed before adding the next. When the rice is finally cooked add butter and Parmesan, stir well and let it stand for about 2 minutes. It will become creamy and eat as soon as possible after cooking.
With heat most of the time.
Medium high heat on the grill is when the coals' color bright amber red.
if no heat is added, then there is no way the chicken can be cooked
You can eat them as they are since they are already cooked or you can heat them up.