Summary of Hazards, Risks, and Scientific Safety

## Introduction Understanding **risk** and following **laboratory safety** rules helps you do investigations without harming yourself or others. This guide explains what hazards and risks are, how people judge risk, and practical ways to reduce danger when planning or doing experiments. ## What is Risk? > **Definition:** A hazard is something that could potentially cause harm. Risk is the chance that the hazard will actually cause harm and how serious the consequences would be. ### Breaking it down - Hazard = source of possible harm (e.g., a chemical, open flame, microorganism). - Risk = probability that harm occurs combined with the severity of the harm. - High risk = high probability and/or severe consequences. Did you know that the same activity can have different risk levels depending on how it is done and what safety steps are used? ## Estimating Risk - Use observed frequencies: count how often an event happens in a large sample over a set time. For example, count crashes per 100,000 drivers per year to estimate driving risk. - Consider both likelihood and consequence when deciding if an activity is acceptable. ## People and Perception of Risk > **Definition:** Perception of risk is how risky people think something is; it may differ from the actual risk. ### Key ideas - People accept minor consequences more easily even if the chance of occurrence is higher (e.g., cutting a finger while chopping vegetables). - Voluntary risks (choosing to do an activity) are usually more acceptable than imposed risks (risk placed on you, such as a nearby factory). - Familiar activities often feel safer than unfamiliar ones, even when objective risk is higher (e.g., cycling vs. air travel). - Long-term or invisible harms (like those from tanning beds or some new technologies) are often underestimated. Fun fact: People often fear air travel more than driving, even though statistics show air travel is much safer per kilometre travelled. ## New Technology and Emerging Risks - Advances (e.g., nanoparticles in cosmetics) can bring unknown or long-term effects. - Weigh potential benefits (better sun protection, medical advances) against possible risks. - Where uncertainty exists, use cautious assessment and monitoring. ## Hazards in Investigations > **Definition:** Laboratory hazards are specific sources of harm encountered during experiments, such as microorganisms, chemicals, fire, and electricity. ### Common laboratory hazards and examples - Microorganisms: some bacteria can cause illness. - Chemicals: strong acids like sulfuric acid can burn; alcohols are flammable. - Fire: unattended Bunsen burners or flammable solvents can ignite. - Electricity: damaged or wet electrical equipment can give shocks. ### Planning for safety 1. Identify every hazard you might meet in the investigation. 2. Assess the risk (likelihood and severity) for each hazard. 3. Decide and implement control measures to reduce risk. ### Practical controls (examples) - Working with sulfuric acid: always wear gloves and safety goggles to reduce the chance of skin or eye contact. - Using a Bunsen burner: place it on a heat-proof mat and keep flammable materials away to reduce fire risk. - Handling microorganisms: use sterile technique, correct disposal, and personal protective equipment (PPE). Did you know that simple steps like tying back long hair and removing dangling jewellery can prevent many common lab accidents? ## Comparing Hazard Concepts | Concept | What it is | Example | Main control measure | |---|---:|---|---| | Hazard | Source of potential harm | Sulfuric acid, flame, bacteria | Identify and isolate | | Risk | Chance and severity of harm | Chemical burn, fire, infection | Reduce probability and consequence | | Perceived risk | What people think | Fear of flying | Education and communication | | Voluntary vs imposed | Who chooses the activity | Choosing to scuba dive vs having factory near home | Consent and risk assessme