In the context of health and safety, a hazard is any source of potential damage, harm, or adverse health effects on something or someone. Hazards can include physical hazards such as noise, radiation, and heat, chemical hazards such as solvents and toxic dusts, and biological hazards such as viruses and bacteria. A risk, on the other hand, is the chance or probability that a person will be harmed or experience an adverse health effect if exposed to a hazard. The level of risk reflects the likelihood of the unwanted event occurring and the potential consequences of that event. Risk assessments are an essential part of workplace safety and involve identifying hazards and assessing the level of risk associated with each hazard, and then putting measures in place to control those risks.