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Jeans length derâzâ-ye Jeans (#) Fr.: longueur de Jeans The critical size of a homogeneous and isothermal interstellar
cloud above which the cloud is unstable and must collapse under its own gravity.
Below this size the cloud's internal pressure is sufficient to resist collapse.
The Jeans length is defined by:
^{2}/Gρ)^{1/2}
= 0.2 pc (T/10 K)^{1/2}(n/10_{H2}^{4}
cm^{-3})^{-1/2},
where c is the → _{s}sound speed, G is the
→ gravitational constant, ρ is the gas density,
T is the gas temperature, and n is the
molecular hydrogen density._{H2} |