Milk is a heterogeneous mixture that contains different types of particles in different phases. due to the sizes of the particles in milk and the way they are dispersed, the particles do not easily settle out. they also cannot easily be filtered out

Milk is not a heterogeneous mixture rather it is a homogeneous mixture. This is because the different components in milk do not separate visibly. Also, it has uniform properties throughout the mixture and the components cannot be filtered out easily.

They cool it down and aluminum cools easily