The ______ is the temperature of saturation at a certain atmospheric pressure.

The dew point is the temperature at which air becomes saturated with moisture, leading to the formation of dew. It is specifically related to the amount of moisture in the air and the atmospheric pressure. When the temperature drops to the dew point, the air can no longer hold all the moisture, resulting in condensation. Understanding the dew point is crucial in fields such as meteorology and building science, as it affects humidity levels and comfort within structures.

In contrast, the boiling point refers to the temperature at which a liquid changes to a gas at a given pressure, and the freezing point is the temperature at which a liquid becomes solid. The melting point signifies the temperature at which a solid becomes a liquid. These terms describe phase changes rather than saturation in relation to atmospheric moisture.