Can I use a 85w adaptor with my (60w) MacBook Air?

I have an old MBP and a new MBA.  Can I use the old 85w adaptor with the MBA?

crh24 wrote:
The question to be answered is pretty simple:
"Does the increased output cause a high enough rise in temperature to shorten the life of even one of the components in the charger?" 
If the answer is "yes" then do so at your own risk.  If the answer is "no", then it is safe to do so and all you face is a longer charge time.
As users with no insight into the design specifications of the charger we have no appreciable method to determine the answer to that question.  Therefore I hold the position that I will use a lower powered charger only if forced by circumstances to do so.  I will not do so as a 'routine' method of charging my devices.
Ohms Law has not been repealed!
An 85w supply connected to a 60w load will output 60w, somewhat less than it is capable of and no more than the load (your Mac) needs.
The reverse case is that a 60w supply connected to an 85w load will output 60w, less than the load needs (but more than enough to operate) and 60w is the design output so the supply will be just fine.

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