What is why do car windows get foggy when making out?

Car windows fog up during intimate moments due to a combination of factors related to humidity, temperature, and condensation. Here's a breakdown:

• Increased Humidity: When people are in a confined space like a car, especially during physical activity and heavy breathing associated with kissing or other intimate acts, they release moisture into the air. This increases the humidity level inside the car.

• Warm Breath vs. Cold Surface: Warm, moist breath comes into contact with the cooler surface of the car windows. This is because the temperature outside the car is often lower than inside the car.

• Condensation Formation: When warm, moist air touches a cold surface (the window), the air cools down. Cool air can hold less moisture than warm air. This causes the water vapor in the air to change state from a gas to a liquid, a process known as condensation. The condensed water droplets form fog on the window's surface.

• Poor Ventilation: A car with closed windows and no airflow traps the humid air inside, exacerbating the problem. Lack of ventilation prevents the moisture from escaping, causing the fog to build up more quickly.