In a steam-water mixture, dryness fraction x represents what?

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Multiple Choice

In a steam-water mixture, dryness fraction x represents what?

Dryness fraction, or quality, is the mass fraction of vapor in a two-phase steam-water mixture. It is defined as x = m_v / (m_v + m_l), so it tells you how much of the mixture by mass is vapor, not its temperature or pressure. At a given pressure in the saturated region, mixture properties are found by weighting between saturated liquid and saturated vapor values (for example, h = h_f + x h_fg). If x is 0, the mix is all liquid; if x is 1, it is all vapor. So the dryness fraction represents the proportion of vapor to the total mixture.

Dryness fraction, or quality, is the mass fraction of vapor in a two-phase steam-water mixture. It is defined as x = m_v / (m_v + m_l), so it tells you how much of the mixture by mass is vapor, not its temperature or pressure. At a given pressure in the saturated region, mixture properties are found by weighting between saturated liquid and saturated vapor values (for example, h = h_f + x h_fg). If x is 0, the mix is all liquid; if x is 1, it is all vapor. So the dryness fraction represents the proportion of vapor to the total mixture.

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