If you had a big jar and it was just big enough to hold the Eiffel Tower the air in the jar would be heavier then the Eiffel Tower.

 

I challenge that. Please show a calculation.

Seems to be correct, I did some fast calculations and it could be right due to its

big ground area and very small top.

http://www.tour-eiffel.fr/teiffel/uk/documentation/structure/page/chiffres.html

you can mesure airs mass, but you will have great difficultly measuring its weigth, as gravity isnt powerful enougth on earth to stop it diffusing significantly in three dimentions. you can however measure the pressure it applies, which i believe is around 10^5 Pa

If you had a big jar and it was just big enough to hold the Eiffel Tower the air in the jar would be heavier then the Eiffel Tower.

It most certainly will not.

Seems to be correct' date=' I did some fast calculations and it could be right due to its

big ground area and very small top.

http://www.tour-eiffel.fr/teiffel/uk/documentation/structure/page/chiffres.html[/quote']

 

So a square container would be roughly 125 m x 125 m x 300 m = 4687500 m³, and air has a density of about 1.25 kg/m³, so that's 5.86 x 10⁶kg. The tower's weight is given as 7300 tons, or ~6.6 x 10⁶kg.

 

And I didn't even insist on a triangular-pyramid-shaped glass, so that I could put the tower in upside-down, which gains about a factor of three in excluded air. Nobody said the jar had to be a cylinder

you can mesure airs mass, but you will have great difficultly measuring its weigth, as gravity isnt powerful enougth on earth to stop it diffusing significantly in three dimentions. you can however measure the pressure it applies, which i believe is around 10^5 Pa

 

Once you have the mass the weight is trivial. W = mg

So a square container would be roughly 125 m x 125 m x 300 m = 4687500 m³' date=' and air has a density of about 1.25 kg/m[sup']3[/sup], so that's 5.86 x 10⁶kg. The tower's weight is given as 7300 tons, or ~6.6 x 10⁶kg.

 

And I didn't even insist on a triangular-pyramid-shaped glass, so that I could put the tower in upside-down, which gains about a factor of three in excluded air. Nobody said the jar had to be a cylinder

That is actually suprisingly close - although like you said the jar doesn't have to be a cylinder.

The jar is cylinder shaped. (so forget about all other shapes)

It gives you almost 8000 ton air.

 

- It is 324m (not 300m)

- 1ton=1000kg. (SI)