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it makes noise because its trying to expand which don't make sence i know but if u take a straitner and you turn it up as hot as u can which on mine is 360 and u turn it off then put it under the sink it will make a craking noise and it will try to cool the straitner but it can burn u still if the water isn't cold enough i have done it and the hospital already nows me hahahahahahaha poor hospital but if u do that then it will crakle but don't do it if u don't want to get burned because u will get burnded no matter wat u do

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Q: Why does metal make noise when it expands or contracts for example hot-water pipes or an iron?
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