On 24/04/2017 23:02, Steve Walker wrote:

Correct. You can have a difference of 10 degrees Centigrade, 10 degrees
Celcius or 10 Kelvin and they are the same ... you cannot have 10
degrees Kelvin, it is just wrong! °C is a relative scale, a gradient,

How can it have a gradient when its scalar?

The bit of the equation is just constant + the temp where the
constant for kelvin is zero.