Summary: <p>The entire universe can be described using just seven different units! These are the metre, kilogram, second, ampere, kelvin, mole, and candela and are defined by the The <a href="http://physics.nist.gov/cuu/Units/current.html">International System of Units</a> (SI) as the seven <a href="https://en.wikipedia.org/wiki/SI_base_unit">base units</a> through which all other units can be derived.</p> <p>Learn more about these standard units, their interesting history, and relevance today. <a href="http://www.twitter.com/Keysight_Daniel">Daniel Bogdanoff</a>, Mike Hoffman, and Matthew Woerner discuss.</p> <audio class="wp-audio-shortcode" id="audio-42-30" style="width: 100%;"><a href="https://eestalktech.com/wp-content/uploads/2017/04/the-7-ways-we-describe-the-universe-si-units.mp3">https://eestalktech.com/wp-content/uploads/2017/04/the-7-ways-we-describe-the-universe-si-units.mp3</a></audio> <p>Video (YouTube):</p> <div class="jetpack-video-wrapper"></div> <h1>Discussion Overview:</h1> <p>What is <a class="jive-link-external-small" href="https://community.keysight.com/external-link.jspa?url=http%3A%2F%2Fwww.keysight.com%2Fmain%2Fapplication.jspx%3Fnid%3D-33080.0.00%26lc%3Deng%26cc%3DGB" target="_blank" rel="nofollow noopener noreferrer">Metrology</a>?<br> Meteorology vs <a href="http://www.keysight.com/main/application.jspx?cc=US&lc=eng&ckey=2232321&id=2232321">Metrology</a><br> What are SI Units and what is the international system of units?<br> Why do we even have SI units?<br> The history of the yard, where does the word “ruler” come from?<br> The specific value of the <a href="https://en.wikipedia.org/wiki/Kilogram">kilogram</a> (kg)<br> Basics of the kilogram and how we define mass 07:00</p> <p>The kilogram has sister units.<br> Units of measure defined by constants in the universe are helpful because they don’t change.<br> What makes up a second? (Uses a <a href="https://en.wikipedia.org/wiki/Caesium">cesium atom</a>‘s vibrations)</p> <p>What are<a href="http://physics.nist.gov/cuu/Units/"> base SI units</a>? 12:06<br> What are <a href="http://physics.nist.gov/cuu/Units/units.html">derived SI units</a>? Derived SI units are units of measurement that can be found by selectively combining the seven base SI units. For example, the <a href="http://eestalktech.com/2017/04/26/frog-legs-helped-discover-the-volt/">volt</a>.</p> <p>What is the difference between base and derived SI units?</p> <p>Electrical current, the <a href="http://physics.nist.gov/cuu/Units/ampere.html">Ampere</a>, and Electromagnetics 15:00</p> <p>What is the <a href="https://www.thoughtco.com/definition-of-triple-point-604674">triple point </a>of a substance?<br> It is the temperature and pressure at which a substance’s gas, liquid, and solid states coexist</p> <p>What are <a href="https://en.wikipedia.org/wiki/Mole_(unit)">moles</a> (chemistry) – the quantity of a substance 20:20</p> <p>What is a <a href="http://physics.nist.gov/cuu/Units/candela.html">candela</a>? (Luminous intensity)</p> <p>Planck’s constant is important! How to use Planck’s equation</p> <p>The <a href="https://www.nist.gov/pml/nist-do-it-yourself-watt-balance-made-lego%C2%AE-bricks">Watt balance</a> is replacing the physical versions of the kilogram 26:16</p> <p>Mike’s amazing water bottle flip 38:53</p> <p>EEs Talk Tech is an electrical engineering podcast from Keysight Technologies</p>
