Do you think there is no residual chlorine after the water is boiled?

There is residual chlorine. But as long as the tap water is qualified, no matter which way the water is boiled, the residual chlorine content in the water is within the safe limit. Experiments have shown that there is basically no difference in residual chlorine content in water boiled in different ways. No matter which method of boiling water is not airtight, it can be volatilized, and the residual chlorine content of the water is greatly reduced after boiling. It is suggested that citizens do not need to worry about whether to burn for a while or whether to open the cover. Even after being boiled directly, it needs to be cooled in a cup to drink, which is also a process of volatilization. Therefore, as long as the tap water is qualified, no matter which way the water is boiled, the residual chlorine content in the water is within the safe limit. In the production process of tap water, it needs to go through coagulation, sedimentation, filtration and disinfection and other process links. Among them, disinfection with liquid chlorine is the most commonly used safe, economical, effective and mature disinfection method recognized at home and abroad. Residual chlorine refers to the effective chlorine remaining in the water after the water has been chlorinated and disinfected for a certain period of time. Additional information: According to Yun Wuxin, a Ph.D. in food engineering and a member of the Science Squirrel Club, chlorine gas or chlorine dioxide is a cost-effective way to sterilize tap water and is widely used in many parts of the world. The World Health Organization's standard for residual chlorine in tap water is 5mg/L, but in fact, the residual chlorine content in tap water is controlled below 1mg/L or even lower. According to the conventional indicators of disinfectants in drinking water in my country, the residual chlorine content of the factory water should not be less than 0.05mg/L, and the maximum limit is 4mg/L. According to previous media reports, at present, the residual chlorine content in the factory water of various water plants in Beijing is between 0.4 and 0.8 mg per liter of water, and it will dissipate to a certain extent when it is transported through the pipe network to the user's home.