- published: 25 Mar 2013
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The kilogram or kilogramme (SI unit symbol: kg), is the base unit of mass in the International System of Units (SI) (the Metric system) and is defined as being equal to the mass of the International Prototype of the Kilogram (IPK, also known as "La Grande K" or "Big K").
The gram, 1/1000th of a kilogram, was originally defined in 1795 as the mass of one cubic centimeter of water at the melting point of water. The original prototype kilogram, manufactured in 1799 and from which the IPK is derived, had a mass equal to the mass of 1.000028 dm3 of water at its maximum density at approximately 4 °C.
The kilogram is the only SI base unit with an SI prefix ("kilo", symbol "k") as part of its name. It is also the only SI unit that is still directly defined by an artifact rather than a fundamental physical property that can be reproduced in different laboratories. Three other base units (Cd, A, mol) and 17 derived units (N, Pa, J, W, C, V, F, Ω, S, Wb, T, H, kat, Gy, Sv, lm, lx) in the SI system are defined relative to the kilogram, so its stability is important. Only 8 other units do not require the kilogram in their definition: temperature (K, °C), time and frequency (s, Hz, Bq), length (m), and angle (rad, sr).
The world's roundest object helps solve the longest running problem in measurement -- how to define the kilogram. A kilogram isn't what it used to be. Literally. The original name for it was the 'grave', proposed in 1793 but it fell victim to the French Revolution like its creator, Lavoisier. So begins the tale of the most unusual SI unit. The kilogram is the only base unit with a prefix in its name, and the only one still defined by a physical artifact, the international prototype kilogram or IPK. But the problem with this definition has long been apparent. The IPK doesn't seem to maintain its mass compared to 40 similar cylinders minted at the same time. The goal is therefore to eliminate the kilogram's dependence on a physical object. Two main approaches are being considered to achieve...
Yes, it's only micrograms of difference, but it's still really weird: until 2018, the kilogram is defined as "the weight of this physical object". So what happens when that object changes? Thank you to everyone at the National Physical Laboratory! You can visit them at http://npl.co.uk I'm at https://tomscott.com on Twitter at https://twitter.com/tomscott on Facebook at https://facebook.com/tomscott and on Instagram and Snapchat as tomscottgo
A tribute to Govindas - who hit the streets of Mumbai on Janmashtami (Dahi Handi) and unite the citizens with their incredible enthusiasm and splendid talent! Watch their journey filled with struggles, hurdles and achievements, through the eyes of a World Record holding team. The Mazgaon Tadwadi (a small community in South Mumbai) Mandal, famous for holding a world record for the highest Human Pyramid/Tower (beating Spain) are constantly striving to break their own record once again. With each passing day, they dream bigger and challenge their own fears, to become the best there ever was! This one's for all the Govindas, who selflessly aim higher and come together, all for the love for a festival. Mazgaon Tadwadi [Documentary] Shot by - Pratik Chitalia Govindas - Mazgaon Tadwadi Mandal [M...
We usually think of weight in terms of pounds and kilograms. But how do we decide how much a kilogram actually weighs? Subscribe to Seeker VR - https://www.youtube.com/channel/UCXiR5VZGA_xproMufNXLYZA Inside The Arctic Doomsday Seed Vault For The First Time (360 Video) - https://youtu.be/_LlLsTGKBag How Long Is One Second, Really? - https://youtu.be/ml8mXtDbwqs Sign Up For The Seeker Newsletter Here - http://bit.ly/1UO1PxI Read More: Kilogram conflict resolved at last http://www.nature.com/news/kilogram-conflict-resolved-at-last-1.18550 "For decades, meteorologists have strived to retire 'Le Grand K' - the platinum and iridium cylinder that for 126 years has defined the kilogram from a high-security vault outside Paris. Now it looks as if they at last have the data needed to replace...
The days of a "fixed" kilogram seem to be numbered, with moves afoot to set our SI unites based on fundamental constants. Reddit discussion: http://redd.it/2etf3o Extra from this video: http://youtu.be/XvZGpKQCzzo Standard weights: http://youtu.be/yGfCp7CPx-M Replica of the Parisian kilogram: http://youtu.be/h4XIOpKWc1Y Derek holds a kilo-ball: http://youtu.be/ZMByI4s-D-Y This video features Professor Michael Merrifield: https://twitter.com/ProfMike_M Visit our website at http://www.sixtysymbols.com/ We're on Facebook at http://www.facebook.com/sixtysymbols And Twitter at http://twitter.com/#!/periodicvideos This project features scientists from The University of Nottingham http://bit.ly/NottsPhysics Sixty Symbols videos by Brady Haran A run-down of Brady's channels: http://bit.ly/brad...
The kilogram is the basic unit of mass in the metric system, but there’s a serious problem: the standard that defines how much mass a kilogram actually has isn’t reliable anymore... 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 -- we couldn't make SciShow without them! Shout out to Justin Ove, Andreas Heydeck, Justin Lentz, Will and Sonja Marple, Benny, Chris Peters, Tim Curwick, Philippe von Bergen, Patrick, Fatima Iqbal, Lucy McGlasson, Mark Terrio-Cameron, Accalia Elementia, Kathy & Tim Philip, charles george, Kevin Bealer, Thomas J., and Patrick D. Ashmore. ---------- Like SciShow? Want to help support us, and also get things to put on your walls, ...
Redeem your free trial for The Great Courses Plus: http://ow.ly/Py3T304920R Mass is a challenging concept to tie down, yet it is one of the most crucial measurements in our world. Since the 1800's, we've used a physical artifact as a standard for mass calibration across the world. Within the next few years, that will all change because of this ingenious device: the watt balance. Links: -NIST Lego Watt Balance Paper: http://scitation.aip.org/content/aapt/journal/ajp/83/11/10.1119/1.4929898 -NIST Lego Watt Balance Video: https://www.youtube.com/watch?v=oST_krdqLPQ -Building the Desktop Watt Balance: [Coming soon!] -Watt Balance Technical Drawing Timelapse: https://www.youtube.com/watch?v=VOsJHnG_KfU -Patreon: http://patreon.com/PracticalEngineering -Website: http://practical.engineering -M...
Kilogram releases his 1st single off of his Latest mixtape "Nothing Risked Nothing Gained" hosted by DJ Doitall. This video was. Shot and directed by the Legendary "Itchyhouse Films" (Roc Davis & Jay Rodriguez). Stay Tuned as Kilogram and The Chain Of Command Rise to Stardom. Follow on Twitter http://twitter.com/kilogram3