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? We're conducting a survey of our viewers! If you have time, please give us feedback: https://www.surveymonkey.com/r/SciShowSurvey2017 Hosted by: Michael Aranda ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: KSam Lutfi, Kevin Knupp, Nicholas Smith, Inerri, D.A. Noe, alexander wadsworth, سلطان الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Bella Nash, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick Merrithew, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali, Kevin Bealer, Philippe von Bergen, Chris Peters, Fatima Iqbal, Justin Lentz ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- 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/ ---------- 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