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How Do You Weigh Things in Space?

Astronauts need to know their mass while in orbit, but a normal scale would be free-falling around the Earth with them. So how do they measure their mass without gravity?

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Sources:
https://www.nasa.gov/mission_pages/station/research/experiments/640.html
https://www.youtube.com/watch?v=qE4OoE93fX0
https://www.youtube.com/watch?v=8rt3udip7l4
http://www.thestargarden.co.uk/How-to-weigh-objects-in-space.html
http://hyperphysics.phy-astr.gsu.edu/hbase/shm.html
http://hyperphysics.phy-astr.gsu.edu/hbase/shm2.html
http://blogs.esa.int/promisse/2012/02/10/measure-body-mass-in-space/
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Images:
https://www.nasa.gov/image-feature/astronaut-peggy-whitson-0
https://www.nasa.gov/content/astronaut-chris-cassidy-in-stations-kibo-lab-0
https://www.nasa.gov/mission_pages/station/research/experiments/SLAMMD2.jpg
https://www.nasa.gov/mission_pages/station/research/experiments/SLAMMD3.jpg
https://spaceflight.nasa.gov/gallery/images/station/crew-31/html/iss031e157943.html

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