A room with a single broken mercury thermometer is habitable. However, if a large number of thermometers are broken together, the room should be occupied only after careful handling and adequate ventilation of the room. Mercury thermometer inside the mercury is a single mercury, belongs to the inorganic material, its chemical nature is not active. Once broken, it can enter the body in the form of vapor through the respiratory tract, the intact skin is basically not absorbed, and the digestive tract absorbs very little. Therefore, if the thermometer is broken, you need to be alert to the risk of inhalation. However, at this time, as long as the broken thermometer and scattered mercury collection, pay attention to open the window ventilation can be. The main method of collecting mercury is to gather the scattered mercury into pieces using a piece of cardboard and collect it in a liquid box, then dispose of it as hazardous waste. If the mercury is not collected and evaporates, turn off the air conditioning system and open the windows. To summarize, after the mercury thermometer is broken, the room can be occupied as long as it is properly disposed of and fully ventilated.