Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Experiment showing the weight of air. An airtight vessel filled with air at normal pressure is on an electronic scale, which shows the equipment weighs 411.86 grams. Air is then pumped out of the vessel, as shown by the pressure gauge dropping to 325 hectopascals, around a third of its normal value (1013.25 hPa). The scale is then seen to read 410.89 grams, meaning nearly a gram of air has been removed. When the valve is opened air rushes back into the vessel, and the scale shows the weight increasing back to its initial value.

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Keywords: air, airtight, atmospheric pressure, changing, demonstration, education, educational, electronic scales, evacuating, evacuation, experiment, gas, gauge, mass, physical, physics, pressure, pump, pumping, reading, scale, school, science, scientific, vacuum, weighing, weight

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Weighing air

K003/0106 Rights Managed

Downloadable master

Duration: 00:00:37

Frame size: 1920x1080

Frame rate: 25

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 1.1G

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Capture format: XDCAM EX

Codec: Photo - JPEG

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