In safety terms, what best distinguishes hazard from risk?

In safety terms, what best distinguishes hazard from risk?

• A. A hazard is the actual harm that has occurred; risk is the probability of improvement.
• B. A hazard is a source of potential harm; risk is the probability or likelihood of harm occurring and the severity of that harm.
• C. A hazard is the probability of harm; risk is the severity of potential harm.
• D. Hazard and risk are synonyms; both mean potential danger.

Answer: (B)

The main idea here is that a hazard is a source or situation with the potential to cause harm, while risk is about the chance that harm will occur and how severe it would be if exposure happens. A hazard exists whether or not anyone is exposed—things like a hot surface, a leaking chemical, or exposed wiring are hazards because they could cause harm. Risk, on the other hand, combines how likely it is that someone will be exposed to that hazard and how bad the harm would be if exposure occurs, taking into account controls, duration of exposure, and frequency of contact. For example, a hot surface is a hazard. The risk is determined by whether someone touches it, for how long, and whether there are safeguards like barriers or protective equipment. This distinction matters because you first identify hazards, then assess and manage risk by reducing either the likelihood of exposure or the severity of potential harm through controls. Why this framing is best: it separates the existence of danger from the probability and severity of harm, which aligns with how safety decisions are made—identify hazards, evaluate risk, and apply controls to reduce that risk. The other statements mix up the ideas: harm that has already occurred isn’t a hazard, and risk isn’t simply the probability of improvement or the mere severity of harm. Hazard and risk are related, but they describe different aspects of safety thinking.

The main idea here is that a hazard is a source or situation with the potential to cause harm, while risk is about the chance that harm will occur and how severe it would be if exposure happens. A hazard exists whether or not anyone is exposed—things like a hot surface, a leaking chemical, or exposed wiring are hazards because they could cause harm. Risk, on the other hand, combines how likely it is that someone will be exposed to that hazard and how bad the harm would be if exposure occurs, taking into account controls, duration of exposure, and frequency of contact.

For example, a hot surface is a hazard. The risk is determined by whether someone touches it, for how long, and whether there are safeguards like barriers or protective equipment. This distinction matters because you first identify hazards, then assess and manage risk by reducing either the likelihood of exposure or the severity of potential harm through controls.

Why this framing is best: it separates the existence of danger from the probability and severity of harm, which aligns with how safety decisions are made—identify hazards, evaluate risk, and apply controls to reduce that risk. The other statements mix up the ideas: harm that has already occurred isn’t a hazard, and risk isn’t simply the probability of improvement or the mere severity of harm. Hazard and risk are related, but they describe different aspects of safety thinking.