A hazardous material is a hazardous material because of its physical or chemical properties, not because of the amount that may be present. Smaller quantities, however, may be considered to be insignificant, but the amount depends on the particular material.
it is mercury because mercury is the most hazardous mineral fiber
Because they will burn and explode
fruits..... because they have acid in them?
because they are generally brittle.
because conduce electricity under certain conditions
you can recycle parts of the TV, but not the whole TV
Aluminum ingots are hazardous because they are heavy and could injure you if they dropped on your foot or leg. Other than that, they present no particular hazard once they have cooled.
In a laboratory (that is not a food laboratory designed for tasting) is it never acceptable to taste a chemical because you cannot know for certain that it is not hazardous. You can be misinformed about a hazard, the container can be mislabeled, or the material can be contaminated with a hazardous materials, for example.
High and low pH materials are considered hazardous because they can cause burns or irritation to skin, eyes, and respiratory tract upon contact. High pH materials can also corrode metals and damage surfaces, while low pH materials can be corrosive and react violently with other substances. Both high and low pH materials can be harmful to the environment if not properly handled and disposed of.
Wearing safety glasses is important in dentistry because you need to protect your eyes from hazardous materials and chemicals.
Some materials that do not allow a current to pass through them include rubber, glass, and plastic. These materials are classified as insulators because they have high resistance to the flow of electric current.