The average velocity of effused particles is

Combined with the effusive flow rate, the recoil/thrust force on the system itself is

An example is the recoil force on a balloon with a small hole flying in vacuum.
Ectromelia is a congenital condition where long bones are missing or underdeveloped. Examples include:

Amelia
Hemimelia
Phocomelia
Sirenomelia

References


== External links ==