Here is ur ans
Car radiators are painted black because it emits the most heat through radiation (highest emissivity). This improves the heat transfer out of the radiator when air isn't moving through the radiator.
as u know the word radiation already it is related to that

There are several reasons why radiators in cars are painted black. Some of the main reasons are:



- Black is known to absorb more heat than any other color.
- When the radiator is painted black, it helps to absorb more heat from the engine and dissipate it more efficiently.
- This ensures that the engine stays cool and runs smoothly even under harsh conditions.



- Radiators are made of metal, which is prone to rust and corrosion.
- Painting the radiator black helps to protect it from the harmful effects of water and other elements that can cause corrosion.
- The black paint acts as a barrier between the metal and the outside environment, thus preventing rust and corrosion from forming.



- Black is a popular color for cars, and painting the radiator black can help to improve the overall aesthetics of the vehicle.
- The black radiator blends in well with the other components of the car and gives it a sleek and stylish look.



- Black is a color that is easy to maintain and does not show dirt and grime as easily as other colors.
- A black radiator is easier to clean and requires less maintenance than a radiator painted in a lighter color.

In conclusion, painting radiators in cars black has several benefits, including improved heat absorption, protection from corrosion, improved aesthetics, and easy maintenance.