Highest ascent by a hot air balloon (2004)

Highest ascent by a hot air balloon (2004) (6.61 km)

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Highest ascent by a hot air balloon (2004) (6.61 km)

is 1/2 of Cruising altitude of Airbus commercial jet (13 km)...more
is 5 x Height of Ben Nevis, highest point in British Isles (1.344 km)...more
is 50 x Height of Sydney Harbour Bridge (134 m)...more
is 100 x Height of Sydney Opera House (65 m)...more
is 1000 x Maximum length of a Reticulated Python (6.5 m)...more

If this was a standard unit ...