Anew type of oven that cooks food quickly and more completely is the convection oven. the key difference in this type of oven and a regular oven is that it a) circulates the hot air. b) cooks at higher temperatures. c) irradiates the food at the same time. d) sends heat from the inside of the food to the outside.

Option (A) is the correct answer.

Explanation:

In convection oven there is circulation of hot air. Hot air expands much faster as compared to cold air.

Therefore, this due to the increase in circulation of hot air the food will get cooked or baked at faster rate.

Thus, we can conclude that out of the given options, the key difference in convection oven and a regular oven is that it circulates the hot air.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.