[ dĭ-răks′ ]
A physical constant often used in quantum mechanics in place of Planck's constant, equal to h2π, where h equals Planck's constant. Its symbol is ℏ. Also called h-bar
IS YOUR DESERT PLANT KNOWLEDGE SUCCULENT OR DRIED UP?
Cactus aficionados, don't get left in the dust with this quiz on desert plants. Find out if you have the knowledge to survive this prickly foray into the desert!
Question 1 of 7
This tall, horizontally branched cactus is probably the most recognizable cactus in Arizona. What is it called?
Words nearby Dirac's constant
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.