It also has bearing on how the substance is handle in conjunction with other substances with which it might be mixed. These are important to someone who handles it. Appearance and odor refer to what something looks and smells like. Some gases, such as carbon monoxide, affect you without you ever knowing it. This might be important for someone concerned with environmental effects.
Solubility refers to how much of a substance can dissolve in water or other substances.
Water is frequently used as a standard or base for comparison. Complete means the whole works, such as windshield solvent and ammonia, can dissolve. This factor is of concern during storage and transportation, as well as handling on the job. This is the weight of a gas compared to an equal amount of air, which is 1. This factor can be a problem depending upon whether you are working in a low or high position, particularly in confined spaces, and the vapor rises or falls easily.