Dryness fraction and quality percentage describe the same concept.

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Multiple Choice

Dryness fraction and quality percentage describe the same concept.

Dryness fraction and quality percentage describe how much of a saturated two-phase mixture is in the vapor phase. The dryness fraction, x, is defined as the mass of vapor divided by the total mass: x = m_vapor / (m_vapor + m_liquid). Quality percentage is just that fraction expressed as a percent: quality = x × 100%. So they are the same concept, just shown in different forms. For example, a dryness fraction of 0.92 means a quality of 92%: 92% of the mass is vapor and 8% is liquid, for a mixture at the saturation temperature and pressure of that state. The remaining options refer to other properties—pressure, temperature, or dew point—not to how much of the mixture is vapor.

Dryness fraction and quality percentage describe how much of a saturated two-phase mixture is in the vapor phase. The dryness fraction, x, is defined as the mass of vapor divided by the total mass: x = m_vapor / (m_vapor + m_liquid). Quality percentage is just that fraction expressed as a percent: quality = x × 100%. So they are the same concept, just shown in different forms. For example, a dryness fraction of 0.92 means a quality of 92%: 92% of the mass is vapor and 8% is liquid, for a mixture at the saturation temperature and pressure of that state. The remaining options refer to other properties—pressure, temperature, or dew point—not to how much of the mixture is vapor.

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