When it comes to taps, I have to mention the British taps. In some parts of the UK, the taps are always separated by hot and cold water, cold special ice, hot hot, You burn or you freeze, it seems like there isn' t another choice, "This tradition dates back to a time when hot and cold water were kept separate to prevent contamination through cross connection," he said (https://www.bbc.co.uk/news/uk-england-42948046). some new apartments are also used to adjust the temperature of the single tap, so why are there so many separate faucets, so I found the following reasons.

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As far back as 1965 a code of practice called CP 310 advised that wherever possible hot water taps should be placed on the left.
"One of the reasons to maintain that over the years was reported to be so that the visually impaired would always know which sides the hot and cold were on, "Cold water came from a mains supply and was fit for drinking. Hot water would be serviced by a local storage cistern often situated in the loft.
"This caused an imbalance of pressures which meant that if incorrect taps and valves were installed one stream of water could force its way across to the other."
Water bylaws prevented hot and cold water being mixed because water that had been sitting in a tank in the loft was not deemed safe to drink"( https://www.bbc.co.uk/news/uk-england-42948046). some The British are happy to wash their hands with cold water because they think it helps to shape their character.