What does "x = 1 default" actually mean?

Question

For context, I am a programmer, not a mathematician, so please forgive my math-ignorance.

I am implementing this calculation in an application that I am working on, but at the bottom of the page, I came across something I have not seen before.

Towards the end of the equation in points (26, 27 & 28) 3 items are individually defined as equaling 1 default. Is there any special meaning here? or can I just set their value to be 1?

Thanks!

Answer 1

Thanks,

I took a peek at the javascript implementation for the calculator on the same site.

it turns out to be just as straight forward as it looks:

var kL = 1.0;
var kC = 1.0;
var kH = 1.0;