Flash points are determined experimentally by heating the liquid in a container and then introducing a small flame just above the liquid surface. The temperature at which there is a flash/ignition is recorded as the flash point. Two general methods are called closed-cup and open-cup. The closed-cup method prevents vapors from escaping and therefore usually results in a flash point that is a few degrees lower than in an open cup.
There are two methods for roasting a whole chicken: Regular method: 1  Preheat oven to 350 degrees F (175 degrees C). 2  Roast whole (thawed) chickens for 20 minutes per pound, plus an additional 15 minutes.
Roasting a chicken does not take quite so long as roasting a turkey, however a large chicken could still take over 2 hours to roast. As a general rule, calculate a cooking time of 20 minutes per pound of meat plus an additional 10 - 20 minutes at a temperature of 375ÂºF (190ÂºC). Therefore, a 5 lb chicken will need to be roasting in the oven for at least 1h 50 mins. A 5 lb bird will serve between 4 - 5 people. Some people prefer to set the oven temperature to 450ÂºF (230ÂºC) and roast the bird at this high temperature for the first 10 - 15 minutes or the last 10 - 15 minutes. The rest of the time the chicken should be roasted at 375ÂºF (190ÂºC).