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Precision Scale

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Any thoughts on the vacuum baloon idea?

Forgive me if I'm repeating any previous posts! Has anyone ever tried to measure the lifting capacity of a rigid balloon "filled" with vacuum?
#2. why does a vacuum have less lifting power than gasses such as He or H which weigh more than vacuum?

Sure. You can see it any physics classroom. The rigid balloon is a usually a glass sampling bulb:

http://www.sciencelab.com/page/S/PVAR/23724/60-199530000

It's weight is measured with a precision scale. Then it is evacuated and the weight is measured again. The difference (of a few mg or tens of mg) is the weight of the gas that has been removed. That would also be the buoyancy in air if the sampling bulb was originally filled with air.

Great to measure gas density. Totally useless as a lifting device.

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Precision Scale O 41105 Bell  Yoke w Air Ringer Working Brass Casting
Precision Scale O 41105 Bell Yoke w Air Ringer Working Brass Casting
$8.00
PRECISION SCALE DIESEL STEAM DETAIL PART 56141 ENGINE PILOT LONG BRAKE PIPE 1PR
PRECISION SCALE DIESEL STEAM DETAIL PART 56141 ENGINE PILOT LONG BRAKE PIPE 1PR
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PRECISION SCALE BRASS DIESEL DETAIL PART 5677 EMD GANGWAY DROP STEP PLATFORM 2
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PRECISION SCALE BRASS DIESEL DETAIL PART 5649 4 TRUCK BRAKE CYLINDER PIPES
PRECISION SCALE BRASS DIESEL DETAIL PART 5649 4 TRUCK BRAKE CYLINDER PIPES
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PRECISION SCALE BRASS PASSENGER CAR DETAIL PART 40479 2 SETS STEAM TRAPS
PRECISION SCALE BRASS PASSENGER CAR DETAIL PART 40479 2 SETS STEAM TRAPS
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PRECISION SCALE BRASS DIESEL DETAIL PART 40483 ENGINE CAB 24RL AIR BRAKE STAND
PRECISION SCALE BRASS DIESEL DETAIL PART 40483 ENGINE CAB 24RL AIR BRAKE STAND
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Precision Scale Co O Scale Locomotive Detailing Part 4166 Water scoop tender
Precision Scale Co O Scale Locomotive Detailing Part 4166 Water scoop tender
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PRECISION SCALE BERKSHIRE VALLEY REEFER DETAILS KITS
PRECISION SCALE BERKSHIRE VALLEY REEFER DETAILS KITS
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PRECISION SCALE BRASS PASSENGER CAR DETAIL PART 40778 SET 2 HAND BRAKE WHEELS
PRECISION SCALE BRASS PASSENGER CAR DETAIL PART 40778 SET 2 HAND BRAKE WHEELS
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PRECISION SCALE BRASS DIESEL DETAIL PART 4211 ENGINE CAB NO 6 AIR BRAKE STAND
PRECISION SCALE BRASS DIESEL DETAIL PART 4211 ENGINE CAB NO 6 AIR BRAKE STAND
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Precision Scale Co O Scale Locomotive Detailing Part 4325 Stoker engine w revers
Precision Scale Co O Scale Locomotive Detailing Part 4325 Stoker engine w revers
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Precision Scale Co O Scale Locomotive Detailing Part 4427 Valves check Nathan
Precision Scale Co O Scale Locomotive Detailing Part 4427 Valves check Nathan
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Precision Scale Co O Scale Locomotive Detailing Part 4481 Number boards w plasti
Precision Scale Co O Scale Locomotive Detailing Part 4481 Number boards w plasti
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Precision Scale Co O Scale Locomotive Detailing Part 4569 Headlight 18 dia in
Precision Scale Co O Scale Locomotive Detailing Part 4569 Headlight 18 dia in
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Precision Scale Co O Scale Locomotive Detailing Part 4705 Jets over fire C
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Precision Scale Co O Scale Locomotive Detailing Part 4766 Control water scoop
Precision Scale Co O Scale Locomotive Detailing Part 4766 Control water scoop
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Precision Scale Co O Scale Locomotive Detailing Part 40204 Headlight modern
Precision Scale Co O Scale Locomotive Detailing Part 40204 Headlight modern
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Precision Scale Co O Scale Locomotive Detailing Part 41123 Generator with base
Precision Scale Co O Scale Locomotive Detailing Part 41123 Generator with base
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O On3 PSC 4280 Water Glass Nathan Type C 585 4280 Precision Scale Co Brass
O On3 PSC 4280 Water Glass Nathan Type C 585 4280 Precision Scale Co Brass
$1.99
O On3 PSC 4398 Plumbing Nalco Muffler 585 4398 Precision Scale Brass
O On3 PSC 4398 Plumbing Nalco Muffler 585 4398 Precision Scale Brass
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O On3 PSC 4421 Hinges Smokebox Door pair work 585 4421 Precision Scale Brass
O On3 PSC 4421 Hinges Smokebox Door pair work 585 4421 Precision Scale Brass
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O On3 PSC 41160 Firedoor oil can shelf 585 41160 Precision Scale Brass
O On3 PSC 41160 Firedoor oil can shelf 585 41160 Precision Scale Brass
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6 O ga Precision Scale plastic trolley passenger triple car seats
6 O ga Precision Scale plastic trolley passenger triple car seats
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4 O ga brass marker lamp cores with extended base Precision Scale
4 O ga brass marker lamp cores with extended base Precision Scale
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2 O ga Precision Scale brass engine number boards
2 O ga Precision Scale brass engine number boards
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Precision Scale Fine Scale O Scale 3 Point Track Gauge + Coupler Height Gauge
Precision Scale Fine Scale O Scale 3 Point Track Gauge + Coupler Height Gauge
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Precision Scale O 1254 Lever C class ashpan 2 pieces
Precision Scale O 1254 Lever C class ashpan 2 pieces
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Precision Scale O 4025 Slack Adjustor Manual Universal
Precision Scale O 4025 Slack Adjustor Manual Universal
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Precision Scale O 41309 Grab Iron Straight type 26 length
Precision Scale O 41309 Grab Iron Straight type 26 length
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Lot of 1 O Scale Precision Scale Track and Coupler Height Gauge Tool
Lot of 1 O Scale Precision Scale Track and Coupler Height Gauge Tool
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Precision Scale Southern Pacific Brass O Scale factory painted weathered caboose
Precision Scale Southern Pacific Brass O Scale factory painted weathered caboose
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Precision Scale Company O scale 173 Plate PRR Equipment Trust
Precision Scale Company O scale 173 Plate PRR Equipment Trust
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Precision Scale Company O On3 1185 Brackets pilot lift bar K series
Precision Scale Company O On3 1185 Brackets pilot lift bar K series
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Precision Scale Co O scale 42851 Valve Westinghouse AB distributing
Precision Scale Co O scale 42851 Valve Westinghouse AB distributing
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Precision Scale Co O scale 4390 Air hose w shut off  union extended pilot
Precision Scale Co O scale 4390 Air hose w shut off union extended pilot
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Precision Scale Co O scale 40454 Fulcrum w chain Ajax brake rod
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Precision Scale Co O scale 40541 Latches door PFE reefer
Precision Scale Co O scale 40541 Latches door PFE reefer
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Precision Scale Co O scale 40601 Box contact ATC reset
Precision Scale Co O scale 40601 Box contact ATC reset
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Precision Scale Co O scale 40709 Valve control Wabco D 22 AR
Precision Scale Co O scale 40709 Valve control Wabco D 22 AR
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Precision Scale Co O scale 40716 Levers w clevis long hopper car brakes
Precision Scale Co O scale 40716 Levers w clevis long hopper car brakes
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