Why turn off the fire about 3 minutes after the water boils?
27 years old
2018-06-30
My wife taught me to turn off the fire about 3 minutes after the water is boiled. Why is it turned off about 3 minutes after the water is boiled?
1 Answer These messages are for reference only
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BY Mamie Doris 2018-06-30Because the water contains halogenated hydrocarbons. When the water temperature reached 90°C, the content of halogenated hydrocarbons increased from 53 micrograms per liter to 191 micrograms, and chloroform rose from 43.8 micrograms per liter to 177 micrograms, both exceeding the national standard by 2 times. When the water temperature rose to 100 ℃, the content of halogenated hydrocarbons and chloroform fell to 110 micrograms and 99 micrograms, respectively, still exceeding national standards. If boiling continues for 3 minutes, the content of halogenated hydrocarbons and chloroform drops to 9.2 micrograms and 8.3 micrograms, respectively, before becoming safe drinking water.7
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