When evaluating a risk, think about factors such as:
A precaution is something that can be done to reduce a risk of harm. Different substances and different practical procedures need different precautions. A risk assessment describes the hazards and risks of harm, and what suitable precautions are needed to work more safely.
Possible precautions include:
When suggesting suitable precautions, make sure the suggestions are appropriate to the particular procedure. For example, the risk of harm from hydrochloric acid is reduced if the acid is diluted with water, and if eye protection and gloves are worn.
Ethanol is a flammable liquid. A student wants to use a Bunsen burner to heat a test tube of ethanol. Explain one suitable precaution, other than wearing eye protection and gloves, to reduce the risk of harm in this procedure.
The student could heat the ethanol using a hot water bath, with water from a kettle. This will reduce the chance of the ethanol catching fire.