Mercury has a certain degree of toxicity and is generally not exposed to it. In the case of a broken mercury thermometer, it usually evaporates in about eight hours at room temperature. Mercury, if evaporated into a gaseous state in the room, can easily be inhaled by people and may lead to dizziness, headache, nausea and vomiting and other symptoms of poisoning. To avoid poisoning, the correct way to handle the mercury thermometer after breaking: open the window, maintain good ventilation; the mercury ball dropped on the ground to collect, in a small bottle, this process should be noted that the hands try not to contact with mercury; with ferric chloride solution, bleach solution or sulfur powder to clean the ground, and then the collected mercury sent to the environmental protection department, chemical laboratories for safekeeping. In general mercury thermometer broken, the volatile mercury usually does not reach the standard of poisoning, so if you can handle in time, generally will not cause serious impact on the human body, do not worry too much.