Why isn’t blood pressure measured in pounds per square inch like every other pressure measurement?
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as others said, it uses same units as the first doctors used.
medical field does changed without a good reason. Everybody is trained to understand same units, including some very young and very old healthcare workers. All medical equipment uses the same scale.
Switching to different units does not provide any advantage (it is all simple rescaling), but will cost a lot to replace equipment, it will take time to retrain workers, and people will be making mistakes: recall the young and the old, and consider the stress of the situations they have to deal with.
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