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Brownian Motion

Brownian motion or pedesis (from Greek: πήδησις /pɛ̌ːdɛːsis/ “leaping”) is the random motion of particles suspended in a fluid (a liquid or a gas) resulting from their collision with the quick atoms or molecules in the gas or liquid.

The New Atomic Clock Will Be Accurate for 15 Billion Years

The world’s most accurate optical atomic clock is now three times more precise than it was a year ago, thanks to engineers and physicists at the National Institute of Standards and Technology and the University of Colorado’s JILA lab. Said clock could keep time for 15 billion years, the approximate age of the universe, and be assured of never gaining or losing a second. In terms of stability, or how close one tick matches the next tock, this is an improvement of about 50 percent over last year at this time, when the JILA clock set the previous world record. Now, the clock is capable of detecting shifts in gravitational effects—per relativity, gravity distorts time—that result from lifting it a mere two inches above the Earth’s surface.