What safety measure should be taken when handling hot glassware?

When handling hot glassware, using a clamp or tongs is the safest measure because it prevents direct contact with the hot surface, which can cause serious burns or injuries. Glass can retain heat for a long time, and handling it without protective tools increases the risk of accidents. By securing the glassware with clamps or tongs, you can manipulate it safely and effectively while minimizing your exposure to heat.

Other methods, such as using bare hands to feel the temperature, pose significant risks as the skin may not be able to detect the heat until it is too late. Immersing hot glassware in cold water can cause thermal shock, leading to shattering and potential injury. Ensuring that glassware is not heated before handling is impractical in many situations, such as during experiments where heat is essential. Therefore, the use of clamps or tongs ensures safe handling practices in the laboratory setting.