Using the psychrometric chart, what would be the approximate dry bulb temperature in degrees F with a humidity ratio of 79 grains per # dry air and a wet bulb temperature of 68 degrees F?

To determine the dry bulb temperature given a humidity ratio of 79 grains per pound of dry air and a wet bulb temperature of 68 degrees Fahrenheit, one would typically refer to the psychrometric chart, which visually represents the relationships among various properties of moist air.

In this scenario, the wet bulb temperature is a crucial point of reference. It reflects the lowest temperature that can be attained by evaporating water into the air at constant pressure. At 68 degrees Fahrenheit wet bulb temperature and a humidity ratio of 79 grains per pound, there's a specific range of possible dry bulb temperatures.

Using the psychrometric chart, you can locate the line for a wet bulb temperature of 68 degrees. From there, you track horizontally until you intersect the line representing a humidity ratio of 79 grains per pound of dry air. The intersection point gives an approximate dry bulb temperature.

The temperature of 80 degrees Fahrenheit aligns with this relationship well. It is also consistent with the moisture content indicated by the humidity ratio, as higher humidity ratios correspond to higher moisture levels in the air, which generally correlate to elevated dry bulb temperatures when the wet bulb is known.

Thus, based on the properties and relationships indicated in the psychrometric chart, 80 degrees Fahrenheit