What dictates the *efficiency* of turning supplied gas into stars at the scale of individual Giant Molecular Clouds (GMCs)?

Answer

Internal dynamics such as turbulence and magnetic fields

While galaxy-scale factors control gas supply, the efficiency of conversion at the GMC level is governed by internal dynamics like turbulence and magnetic fields.

What dictates the *efficiency* of turning supplied gas into stars at the scale of individual Giant Molecular Clouds (GMCs)?
galaxiesastronomyratestarsstar formation