I was thinking it was going to be this one:

https://youtube.com/watch?v=HbDnxzrbxn4

Missed that one…

“It’s” is a valid contraction of “it has”.

Edit: glossed over the other “it’s”… doh.

Is that not because the copper holds more heat, so stays hot for longer at the same dissipation?

Copper has more mass, heat capacity, and thermal conductivity per litre.

Is aluminium actually more effective as a dissipation surface? I hadn’t heard that.