## Gas consumption timescale

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Roberts time [1] is the gas consumption timescale (reciprocal of star formation efficiency):
where $\mathrm {SFR}$ is the star formation rate and $M_{HI}$ is the mass of neutral hydrogen in the galaxy
• [1]^ M. S. Roberts, The content of galaxies: stars and gas,'' Ann. Rev. Astron. Astrophys. 1 (1963) 149.