After a thermometer is broken, open a window to ventilate the room and then collect the leaking mercury. If there are any injuries to the body during collection, seek medical attention at a hospital. After a thermometer is broken, first open a window to ventilate the room. Mercury is volatile and toxic. Therefore, after the thermometer is broken, the window should be opened immediately for ventilation to promote the volatilization of mercury to avoid adverse consequences. Secondly, after the thermometer is broken, wear rubber gloves to collect the mercury, to avoid direct contact between the human body and the mercury, resulting in adverse consequences. You can use cardboard or wet cotton swabs to clean the mercury, and then put the collected mercury into an airtight bottle. If you are accidentally injured during the process of collecting mercury, it is recommended that you go to the hospital in time to have the wound treated by a professional doctor.