Question

The ratio of the mass of water vapor to the mass of dry air is known as what?

• A. Relative Humidity
• B. Specific Humidity
• C. Mixing Ratio
• D. Dew Point

Hint:

\textbf{Mixing ratio = Water vapor mass / Dry air mass}.

Answer 1

The Correct Option is C

Concept: Humidity parameters describe the amount of water vapor present in the air using different definitions.
Step 1: Understanding the definition.
The ratio of the mass of water vapor to the mass of dry air is called the mixing ratio.
Step 2: Formula.
\[ \text{Mixing Ratio} = \frac{\text{Mass of water vapor}}{\text{Mass of dry air}} \]
Step 3: Eliminating incorrect options.

• Relative humidity is a percentage of saturation.
• Specific humidity is ratio to total air mass.
• Dew point is the temperature at which condensation occurs.

Conclusion:
Thus, the correct answer is Mixing Ratio.