Why is the light scattered by white clouds usually not polarized compared to light scattered by blue clouds?

Light scattered by white clouds is typically not polarized because these clouds consist of many small water droplets that scatter light in multiple directions due to their varying sizes and shapes. In contrast, blue clouds, often associated with Rayleigh scattering, involve smaller particles that scatter shorter wavelengths of light more efficiently and can lead to polarized light. The uniformity and size of the particles in white clouds result in a more isotropic scattering pattern, reducing polarization effects. Thus, the difference in particle size and distribution leads to varying degrees of polarization in the scattered light.