Effusion

Effusion is a way gases get out through small holes in materials.[1] For instance, one may fill a balloon with helium, and later discover that all of the gas has gotten out. Effusion is the opposite of diffusion, as one leaves, while another joins.[1]

References

  1. 1.0 1.1 Lazar, Miriam A.. Let's Review Regents: Physics--Physical Setting 2020 (in en) (2020-06-19)Simon and Schuster. ISBN 978-1-5062-7087-6.