Vacuum Pump

You wish to observe the progress of your vacuum pump in evacuating a tall bell jar for the purpose of demonstr?

You wish to observe the progress of your vacuum pump in evacuating a tall bell jar for the purpose of demonstrating that sound waves do not travel in a vacuum. So you place a mercury barometer inside the bell jar and follow the height of the mercury column as the pump chugs away. When you observe a height of 8.09 mm, what fraction of atmospheric pressure, expressed as a percentage, have you achieved in your bell jar? The density of mercury is 1.36 × 104 kg/m3 and standard atmospheric pressure is 1.01 × 105 Pa.

8.9 mm Hg is (to engineering accuracy) 8.9Torr. Atmospheric pressure is 760 Torr giving your required percentage as 890/760 or 1.17%

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Aoyue 474A++ Digital Desoldering Station with Built in Vacuum Pump
Aoyue 474A++ Digital Desoldering Station with Built in Vacuum Pump
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Pump SHIMADZU TMP 280L Turbo Molecular with Fomblin Oil SN DC002
Pump SHIMADZU TMP 280L Turbo Molecular with Fomblin Oil SN DC002
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AMAT 3620 00363 PIAB Sting X40H6 P Pump Vacuum Eductor 3 8 NPT 418066
AMAT 3620 00363 PIAB Sting X40H6 P Pump Vacuum Eductor 3 8 NPT 418066
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Applied Materials IPUP A100L Dry Vacuum Pump
Applied Materials IPUP A100L Dry Vacuum Pump
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Unused Leybold Turbovac 151 85630 Turbomolecular Vacuum Turbo Pump
Unused Leybold Turbovac 151 85630 Turbomolecular Vacuum Turbo Pump
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Unused Osaka TC1103 Turbomolecular Turbo Vacuum Pump Power Supply
Unused Osaka TC1103 Turbomolecular Turbo Vacuum Pump Power Supply
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Leybold DIVAC 14HV3 Dry Compressing Vacuum Pump
Leybold DIVAC 14HV3 Dry Compressing Vacuum Pump
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Mini IC Pickup Vacuum Pump Pen Set SMT SMD Component
Mini IC Pickup Vacuum Pump Pen Set SMT SMD Component
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Desoldering Pump Sucker Solder Removal Vacuum + 2 Tips
Desoldering Pump Sucker Solder Removal Vacuum + 2 Tips
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Pump SHIMADZU TMP 280L Turbo Molecular with Fomblin Oil CBC165
Pump SHIMADZU TMP 280L Turbo Molecular with Fomblin Oil CBC165
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Pump rebuild kit Teflon YAMADA DP 20 BOC 304040 100 K20 FSI
Pump rebuild kit Teflon YAMADA DP 20 BOC 304040 100 K20 FSI
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Metal Desoldering Pump Solder Sucker Lead Removal Soldering Iron Vacuum Tool New
Metal Desoldering Pump Solder Sucker Lead Removal Soldering Iron Vacuum Tool New
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Ebara A07V Vacuum Pump As Is
Ebara A07V Vacuum Pump As Is
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Edwards Multi Stage Dry Vacuum pump Drystar DP 40 +encl
Edwards Multi Stage Dry Vacuum pump Drystar DP 40 +encl
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Edwards NRY0RH402 Vacuum Pump Interface Cable Reseller Lot of 6 Used Working
Edwards NRY0RH402 Vacuum Pump Interface Cable Reseller Lot of 6 Used Working
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Travaini pumps model EV0 10M MFG 2008 75 KW Air cooled vacuum pump EVO 10M
Travaini pumps model EV0 10M MFG 2008 75 KW Air cooled vacuum pump EVO 10M
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Alcatel Annecy 5150 CP Turbo Vacuum Pump AMAT
Alcatel Annecy 5150 CP Turbo Vacuum Pump AMAT
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Desoldering Pump Sucker Solder Irons Removal Remover Vacuum Desolder
Desoldering Pump Sucker Solder Irons Removal Remover Vacuum Desolder
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OSAKA Vacuum TG 800FCWB Turbo Pump S N 474 +POWER SUPPLY TC31103 + 5M Cable
OSAKA Vacuum TG 800FCWB Turbo Pump S N 474 +POWER SUPPLY TC31103 + 5M Cable
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BOC Edwards Devicenet Interface Module NGR409000 or D37265000
BOC Edwards Devicenet Interface Module NGR409000 or D37265000
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Solder Iron Vacuum Gun Desoldering Pump Sucker Removal Remover Tool 28cm Long
Solder Iron Vacuum Gun Desoldering Pump Sucker Removal Remover Tool 28cm Long
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Desoldering Iron Cautin Pump Vacuum Remover Extractor Replacement Tip for ZD108K
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CTI CRYOGENICS CRYO TORR 8F CRYOPUMP System With ULVAC D 330DK Vacuum Pump
CTI CRYOGENICS CRYO TORR 8F CRYOPUMP System With ULVAC D 330DK Vacuum Pump
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OSAKA VACUUM TURBO PUMP TG390MCWB
OSAKA VACUUM TURBO PUMP TG390MCWB
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Automatic Electric Vacuum Solder Sucker Desoldering Pump Iron Gun 30W AC 220V
Automatic Electric Vacuum Solder Sucker Desoldering Pump Iron Gun 30W AC 220V
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3203 shimadzu mag lev turbo vacuum pump controller
3203 shimadzu mag lev turbo vacuum pump controller
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10 Pcs 2mm Nozzle Iron Tip For Electric Vacuum Solder Sucker Desoldering Pump
10 Pcs 2mm Nozzle Iron Tip For Electric Vacuum Solder Sucker Desoldering Pump
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LyonsBlue Desoldering Vacuum Pump Solder Sucker Solder Removal Tool
LyonsBlue Desoldering Vacuum Pump Solder Sucker Solder Removal Tool
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Desoldering Wick SEALODY Solder Sucker Vacuum Pump  Braid is 25mm Width
Desoldering Wick SEALODY Solder Sucker Vacuum Pump Braid is 25mm Width
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12pcs Portable Electric Handheld Desoldering Gun Vacuum Dual barrel Pump
12pcs Portable Electric Handheld Desoldering Gun Vacuum Dual barrel Pump
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Aluminum Desoldering Vacuum Pump Solder Sucker Removal Remover Tool 20cm Length
Aluminum Desoldering Vacuum Pump Solder Sucker Removal Remover Tool 20cm Length
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Electronic Desoldering Pump Solder Sucker Removal Iron Vacuum Tool Repair
Electronic Desoldering Pump Solder Sucker Removal Iron Vacuum Tool Repair
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Solder Sucker Desoldering Pump Removal Vacuum Soldering Iron Desolder Tools Pen
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Nash Engineering CL Vacuum Pump Compressor Motion Advertising Promo Card A4
Nash Engineering CL Vacuum Pump Compressor Motion Advertising Promo Card A4
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3pcs Aluminium Solder Sucker Desoldering Pump Tool Removal Vacuum Soldering Iron
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AN CORPORATION 1039 SN VACUUM PUMP AMAT 0195 02977
AN CORPORATION 1039 SN VACUUM PUMP AMAT 0195 02977
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Aoyue 474A++ Digital Desoldering Station with Built in Vacuum Pump
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30w 220v 50hz Electric Vacuum Solder Sucker Desoldering Pump Iron Gun Tin Repair
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NEW EDWARDS D37207591 IQ VACUUM PUMP EXTENSION CABLE 4 WAY 3M
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