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If the water content of the steam is 5% by mass, then the steam is said to be 95% dry and has a dryness fraction of 0.95.

Dryness fraction can be expressed as:

ζ = ws / (ww + ws) (1)

where

ζ = dryness fraction

ww = mass of water (kg, lb)

ws = mass of steam (kg, lb)

GAJANAN Nalegaonkar

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Q: What is dryness fraction with answer?
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