Kelvin is the proper scientific scale for measuring temperature. Centigrade is the same thing just offset 273 degrees from the point where molecules stop moving so that 0*Centigrade lines up with water freezing (at sea level and not inside a pressurised system) and 100*C boils water.
Fahrenheit is an example of dogedly following a dumb system and never admitting defeat in logic's face because dammit. .
Anyhoo, now we've cleared that up, the touch test; 50*C is OK but you can't leave your hand there all day.
60*C you have to remove your hand. 70*C you swear and shake it.
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