What is the characteristic of pure propane?

Pure propane is a substance that is colorless in its natural state. This characteristic is important for safety and identification, as it helps differentiate propane from other gases. Although propane is indeed highly flammable and poses a risk of combustion, being colorless means that it does not visibly warn individuals of a gas leak unless an odorant is added.

While pure propane is typically described as odorless, in practice, an odorant is usually added to assist in leak detection because propane by itself does not have a smell. This odorless nature is significant because it indicates that without this added odorant, a leak would not be easily recognizable, which poses safety concerns.

In summary, the defining trait of pure propane is that it is colorless, which is a fundamental property of the substance in its unaltered state.