Concept:The temperature at which air becomes fully saturated with water vapor and condensation begins is called the dew point.
Explanation:Warm air can hold more water vapor than cold air.
When air cools gradually, its ability to hold moisture decreases.
At a specific temperature, the air reaches
100% relative humidity and can no longer hold all the water vapor present.
This temperature is known as the dew point.
At the dew point, the excess water vapor condenses into tiny liquid droplets on surfaces such as grass, leaves, or windows, forming dew.
The other options involve different physical phenomena.
The boiling point is where a liquid changes to vapor throughout the liquid.
The critical point is the temperature and pressure above which gas and liquid are indistinguishable.
The triple point is where solid, liquid, and gas coexist in equilibrium.
Only the dew point describes saturation of air with water vapor followed by condensation.
Answer:A. dew point