Final answer:
The statement about flame color and temperature is true, with a blue flame being hotter due to more oxygen which leads to a more complete combustion process. This concept is applicable across various scientific fields, from chemistry lab equipment to astrophysics and the development of clean energy technologies like FCVs.
Step-by-step explanation:
The statement given is true: a less oxygenated flame tends to be yellowish and cooler, while a flame with more oxygen is blue and hotter. In various applications, such as Bunsen burners in a chemistry lab, the blue flame indicates a more complete combustion reaction due to adequate oxygen supply, leading to a higher temperature and a more efficient and controlled burn. This is contrasted by the yellow flame of a candle, which has limited access to oxygen, resulting in incomplete combustion and a cooler flame temperature.
When comparing flames on a stove, the blue flame is definitely hotter than the red flame. This is because the blue flame indicates a higher level of oxygen in the combustion process, thereby signifying a higher temperature. The color of flames is also used as an indicator of temperature in astrophysics, where a blue star is typically much hotter than a red star.
The principles of combustion and the role of oxygen in generating heat are also relevant in fuel-efficient transportation technologies. For example, fuel-cell vehicles (FCV), which use hydrogen, a highly flammable gas, depend on the presence of oxygen to facilitate combustion and generate power without the pollutants associated with gasoline combustion.