Why on a hot summer days the inside of white car is cooler than black car?

On a hot summer day, the inside of a white car stays cooler than a black car because of the difference in how the colors absorb and reflect sunlight.

* Black absorbs light: Black surfaces absorb almost all wavelengths of visible light. This absorbed light is converted into heat, raising the temperature of the surface and the interior of the car.

* White reflects light: White surfaces reflect most wavelengths of visible light. This means less light energy is converted into heat, resulting in a lower surface temperature and a cooler car interior.

In short, a black car acts like a solar heat collector, while a white car reflects much of the sun's energy away.