17.4.2. Mass Transfer (Dalton’s) Method

Try these first

1. 1.

   What does the empirical constant 'C' in Dalton's Method represent?

   Hint

   Think about adjustments we make in science for specific situations.

2. 2.

   What does eₛ stand for in the context of evaporation?

   Hint

   Consider what it means for air to be saturated with vapor.

3. 3.

   What does the vapor pressure deficit measure?

   • The difference between actual and saturation vapor pressures
   • Only the actual vapor pressure
   • Wind speed

   Hint

   Recall that it is about two types of vapor pressures.

4. 4.

   Dalton's Method is sensitive to measurement errors.

   • True
   • False

   Hint

   Think about the importance of accurate measurements in scientific methods.

5. 5.

   A research team measures the saturation vapor pressure at a lake to be 2.2 kPa and the actual vapor pressure to be 0.9 kPa. If the wind speed is 5 m/s and they have found an empirical constant 'C' of 0.9, calculate the evaporation rate.

   Hint

   Plug in the values carefully to find the evaporation rate.

6. 6.

   Consider a scenario where rainfall reduces the actual vapor pressure significantly. How does this impact the evaporation calculation using Dalton’s Method?

   Hint

   Think about how humidity and moisture levels directly affect evaporation.