[Amps] Anodizing aluminum, painting etc.

[Gary Schafer]

Some of the confusion about heat sinks I think comes from referring to
"mass" of the sink. Mass is really the same thing as weight. Weight of a
sink by itself has no real effect on its ability to dissipate heat. If it
did then lead would probably be the desired material.
Each type of material has its own thermal conducting characteristics.
Aluminum happens to be quite good at it.

A heat sink is really a heat exchanger just like an air conditioner. Making
the heat sink heavier by making it a larger block doesn't necessarily make
it a better heat sink. Larger will hold more heat but it is surface area
that gets rid of the heat.

Think of a heat sink as a surface transformer. It effectively enlarges the
surface area of a device.

73
Gary  K4FMX