What is the relative humidity percentage at the dew point?

The relative humidity percentage at the dew point is indeed 100%. This is because the dew point is defined as the temperature at which air becomes saturated with moisture. When air reaches the dew point, it contains the maximum amount of water vapor it can hold at that specific temperature, leading to 100% relative humidity. At this point, any additional cooling or increase in moisture content will result in the condensation of water vapor into liquid form, which is why it's directly associated with saturation.

In contrast, humidity percentages lower than 100% indicate that there is still capacity for the air to hold more moisture without condensation occurring. This understanding is crucial in water restoration as monitoring and managing humidity levels are essential in preventing mold growth and ensuring effective drying processes.