Why America Still Uses Fahrenheit

Why does America still use the Fahrenheit system to measure temperature, when the rest of the world uses Celsius? I figured it was because we are lazy and don't want to learn a whole new system. Vox looks more deeply into the question.

(YouTube link)

Fahrenheit is just one of the ways Americans are holdovers for imperial measurements, when the rest of the world is using the metric system. And Americans will stay on the imperial system until someone finds a way to make the conversion profitable. -via Laughing Squid

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Of course there is profit to be made by conversion, for all of the people selling new hardware, new tooling for metric threads, a premium for obsolete parts, etc.

Temperature would be an easier switch at least, as it is mostly a relabeling. But I still prefer temperature measured in electron volts. Room temperature is 25 meV, and you probably don't want to go outside if it is below 20 meV or above 27 meV.
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A big retailer with overseas suppliers could force the transition to metric. For instance, Walmart could switch its products to metric-exclusive sizes, saying that suppliers will not need to maintain different production lines for two different markets. This would, of course, be linked to a promise of lower prices.
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I used to be a proponent of going metric, but now am quite happy leaving everything alone. That came with the realization that all systems are equally convenient, just different. e.g. while metric is easy to work with orders of magnitude, imperial is much easier to divide or multiply by 2.
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Maybe the question should be why did others go to metric. I used it in the Army and in scientific research, but in everyday things, pounds, feet, etc. are a lot easier to estimate.
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