What is window space factor?

What is window space factor? Correct Answer window space factor = copper area in the window / total window area

Window space factor is the ratio of the copper area in the window to the total window area. It is a constant used in the output equation of transformers.
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What does the window space factor depend on?
What is the empirical formula for calculating the value of window space factor?
What is the empirical value of window space factor, given the output is 1000kV?
What is the ratings of the transformers for using the empirical value of window space factor?
What is the formula for the window space factor, when the output is 1000 kVA?