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.
A large chicken could even take about 2 hours to fully get roasted. The general thumb rule for preparing roast chicken is a cooking time of about 20 minutes for every pound of meat and another 10 to 20 minutes at a temperature of 350 degrees F in the oven. Hence, if you want to prepare a chicken roast to serve 4 â 5 people, you would require about 5 lb meat and a total cooking time of 1 hour 50 minutes. Some people, however, prefer to roast the chicken on high heat of about 450 degrees F for the first and last 15 minutes (a total time of half an hour).