Risk is best defined as

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BlackTom AI · Accepted Answer

To start, let's consider the concept of risk in occupational health and safety terminology. 
Option 1: 'The probability of an accident' focuses narrowly on how likely an incident is, but risk encompasses more than just likelihood; it also involves the potential impact or severity if that event were to occur.
Option 2: 'The hazard presented by a chemical or procedure' describes hazard, which is the inherent property that could cause harm. Risk includes hazard but also the exposure and the probability of harm occurring, so this option is incomplete as a definition of risk itself.
Option 3: 'The severity of harm that may occur' concentrates on the potential consequences or outcome magnitude, which is only one component of risk. Without considering how exposure or likelihood plays into whether that harm would actually occur, this does not fully define risk.
Option 4: 'The combination of the severity and likelihood of exposure' integrates both how serious the harm could be (severity) and how likely that exposure is to happen (likelihood), which together determine the overall risk level. This aligns with standard risk definitions that require both consequence and probability of exposure to quantify risk.
Thus, comparing all options, the most comprehensive and accurate definition of risk is the one that combines severity and likelihood of exposure.

W25 CHEM D012A 53, 54 Organic Chemistry I Safety Quiz (ACS Youtube videos)

Risk is best defined as

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