What is the characteristic appearance and smell of LPG?

The characteristic appearance and smell of LPG (liquefied petroleum gas) is colorless and odorless. This property is significant for safety reasons, as it allows for the safe handling of LPG without the distraction of visual or olfactory cues that could potentially lead to misperceptions about its presence.

However, to enhance safety and leak detection, an odorant, typically a compound called ethyl mercaptan, is added to LPG. This gives it a distinct smell, often described as similar to rotten eggs, helping anyone detect a leak easily since pure LPG itself does not possess any smell. This characteristic ensures that users are aware of any gas leaks, reducing the risk of dangerous situations.

The other options do not accurately reflect the characteristics of LPG. Blue and sweet, green and fruity, and yellow and sour are not associated with LPG and could lead to misconceptions about its properties. Therefore, understanding that LPG is colorless and odorless, yet treated for safety with a distinct odor, is crucial for anyone working with or around this fuel.