memes

They are both made up but what is the fahrenheit? Where does the scale start? How much does it increment by? How does it relate to other units?

Celcius starts at the melting point of water at sea level and each increment is 1% of the required change to turn water from frozen to boiling. This is arbitrary yes, but the importance is not if it's arbitrary but that it is a description of a physical property in our world that can be experimentally repeated, tested and verified. No authority can arbitrarily decide that a degree Celcius is actually different from what it was last year.

There's a reason that all imperial units are scientifically described by their relation to their metric counterpart and it's because metric units are based on physical properties of the universe around us and so we can measure them as opposed to just define them.

Yes both are made up. As everything we use to count or measure is.

However it depends how they were made up.

Fahrenheit was set to 0 on the lowest temperature someone could achieve at time. And 100 was set to the body temperature of the human body. Totally two comparable points of measurement.

Celsius uses the melting point of water as 0.and then uses, revolutionary, the same water when it changes its state from liquid to gas.