Final answer:
The dew point is the temperature at which air becomes saturated with water vapor, leading to condensation. In the given scenario, the dew point is 8°C, the temperature when condensation forms on a car window.
Step-by-step explanation:
The dew point is the temperature at which the water vapor in the air becomes saturated and condensation begins to form. If condensation starts forming on the window of a car at 8°C, this temperature is indeed the dew point. This means that the air temperature must equal or fall below this temperature for the airborne water vapor to start condensing into liquid water droplets. This concept is vital because it signifies the point where the air can no longer 'hold' all the moisture, leading to phenomena such as dew, fog, or frost depending on the specific temperature.
Dew point measurements are especially important for various applications, including weather prediction and agricultural planning, as they can indicate potential frost, which can affect crops, or provide insights into how quickly temperatures may fall overnight.