most countries use Celsius. the Fahrenheit metric was developed first but was deemed inappropriate in Europe during the 17th/18th centuries because it used a non-zero point for freezing of water. A centigrade scale was deemed more workable and was thus developed. The USA stuck with the original Fahrenheit system for some reason.
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It can be a conversion factor - though not necessarily. For example, 68 deg Fahrenheit = 20 deg Celsius. But there is no conversion factor for F-to-C: instead there is a linear equation.
because of its hard shell
Kelvin has the advantage that it is an absolute temperature scale - it starts from absolute zero. This simplifies several calculations; for example, in an ideal gas, at constant pressure, the volume of the gas is proportional to the absolute temperature. Similarly, calculations related to heat machines are simpler if an absolute temperature scale is used.
Oh, dude, to change the units on your Nissan 350Z's computer, you'll need to access the settings menu, like, go to the display options, and switch from miles to kilometers and Fahrenheit to Celsius. It's, like, super easy, just a couple of clicks and you're good to go. Enjoy your newfound metric system enlightenment!
Because they are conservative. The rest of the world, apart form Burma and Liberia, have adopted the SI system because it is a far superior system of measurement but the US stubbornly does not view that as progress. Is that because it was not led by Americans, I wonder! US scientists have adopted it - and when NASA scientists did not, it led to the disaster of the Mars climate orbiter.