Why does white smoke come out of the exhaust pipe when starting a cold engine?

[DeSebastian]

Here is an introduction to the reasons why white smoke comes out of the exhaust pipe when starting a cold engine: 1. The phenomenon of white smoke from the car is very common in winter, because the white smoke seen is basically water vapor. Under normal circumstances, the water vapor produced after gasoline combustion is discharged normally through the exhaust pipe. Since the ambient temperature is relatively low, the water vapor will condense into small water droplets and become visible water vapor to the naked eye. 2. There is a fault. Because some coolant enters the cylinder and is discharged with the exhaust gas, and because the temperature is very high, it will come out in the form of water vapor.