What is the Dew Point for a Dry Bulb Temperature of 70°F with 40% Relative Humidity?

To determine the dew point given a dry bulb temperature of 70°F and a relative humidity of 40%, you can use a psychrometric chart or calculations that involve the relationship between temperature, relative humidity, and dew point.

The dew point is the temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid form. At 70°F with a relative humidity of 40%, the air is not saturated, meaning the dew point will be lower than the dry bulb temperature.

Utilizing psychrometric principles, the dew point can be approximated. Generally, for a given dry bulb temperature, as relative humidity increases, the dew point also increases, but for 40% relative humidity, it's well below 70°F. The calculation or lookup shows that the dew point converges around 45°F for these conditions.

Thus, the correct answer aligns with the dew point that corresponds accurately to the given dry bulb temperature and relative humidity.