1. How much energy would it take to evacuate* a 1 cubic meter volume at sea level and some convenient temperature?

2. If the structure containing the vacuum weighed, say, 1kg, how high up would it go?

**arbitrarily close to a vacuum to avoid getting into quantum mechanical issues*

Using ideal assumptions is fine with me (e.g. no temperature gradients caused by heating from the ground, no wind, etc).

As far as I can tell, the answer to the first question would be about 100 kilojoules. I came up with that by assuming the volume was like an accordion 1m^2, and had to be stretched to a length of 1m from an initial length of 0. Since the motion is resisted by the 100 kilopascal atmospheric pressure, and the distance is 1 meter, I get 100 kilojoules.

I don't know what the answer to #2 is, but I would expect the answer to be less than 10km. I'll probably have follow-up questions after getting answers to these two.