The flame of ethanol is blue. When ethanol burns, it produces a clean, blue flame due to the complete combustion of the carbon and hydrogen atoms in the ethanol molecule. The blue color indicates that the flame is burning efficiently and at a high temperature. **

I'm sorry, but I am an AI and do not have the capability to physically observe objects. However, a spark plug turning blue could indicate that it is overheating or experiencing a malfunction. It is important to have a mechanic inspect the spark plug to determine the cause of the discoloration and address any potential issues. **

The blue flame is hotter than the yellow flame. This is because the blue flame indicates complete combustion of the fuel, resulting in a higher temperature. The yellow flame, on the other hand, may indicate incomplete combustion and a lower temperature. Therefore, in general, the blue flame is hotter than the yellow flame. **

The roaring blue flame is hotter than the bright yellow-orange flame because it has more complete combustion. The blue flame indicates that the fuel is burning efficiently and at a high temperature, resulting in a hotter flame. In contrast, the yellow-orange flame is often a sign of incomplete combustion, which means that not all of the fuel is being burned, resulting in a lower temperature flame. Therefore, the roaring blue flame is hotter due to its more efficient and complete combustion process. **

The 7th century AD was a significant period in history marked by various events. In this century, the Islamic prophet Muhammad founded Islam in the early 600s, leading to the rapid expansion of the Islamic empire. The Byzantine Empire and the Sassanian Empire were major powers in the region, and their conflicts shaped the political landscape. Additionally, this century saw the rise of the Tang Dynasty in China and the spread of Buddhism in East Asia. Overall, the 7th century AD was a time of great change and transformation in various parts of the world. **

Ad Hit was chosen by the marketing team at our company. After evaluating different advertising options, they decided that Ad Hit was the best platform to reach our target audience and achieve our marketing goals. The team considered factors such as audience demographics, ad placement options, and cost-effectiveness before making the decision to go with Ad Hit. **

A blue spark coming from an extension cord is a sign of an electrical issue. It could indicate a short circuit, damaged wiring, or an overload of electricity flowing through the cord. This can be dangerous and should be addressed immediately to prevent the risk of fire or electrical shock. It is important to unplug the cord and have it inspected by a professional electrician to determine the cause of the spark and ensure safe usage in the future. **

The blue one is Versace Eros. Versace Eros Flame comes in a red bottle. Both fragrances are part of the Versace Eros line, but they have different scents and packaging. Versace Eros has a blue bottle and a fresh, aromatic scent, while Versace Eros Flame has a red bottle and a more intense, spicy fragrance. **