How new Mac keeps itself cool without fan?

The new apple mac has a lot of efficient heat management. It is recorded that it has good heat management than a PC having water cooling system.

Explanation

The fans in any laptop is connected to CPU through a copper metal heat pipe. This heat pipe is placed over the CPU. This heat pipe sucks only a little amount of heat from the CPU and then fan can also only a decrease the temperature only to a small extent.

Heat sink in a normal laptop

But now in new mac aluminum heat spreader is used which is way more efficient because it is directly connected to the CPU and aluminum is a very efficient heat sucker.

Mac heat sinks

But why aluminum

1. The metal with most thermal conductivity is Silver and Copper but they are way more expensive so aluminum is the best to use. In relation to its weight is almost twice as good a conductor as copper. See the graph

Thermal Conductivity of different metals

2. Consistency

Thermal conductivity of aluminum in different temperature

3. Non-magnetic

4. Sound and Shock Absorption

5. Non-sparking

6. Recyclability

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