Measurement of single and multi-jet cross sections in proton-proton collisions at 7 TeV centre-of-mass energy with ATLAS

Jets are a spray of collimated particles, foot-print of the dynamics governing the production of quarks and gluons, produced in high energy collisions. Their measurement at hadron collider is the method "par excellence" to investigate the strong dynamics in different regimes. The ATLAS Collaboration performed several measurements of the jet production in proton-proton collision at $sqrt{s}=$~7 TeV. Thanks to the high production rate of jets in 2010, with an integrated luminosity of 37 pb$^{-1}$, and to the high quality of the recorded data, these measurements quickly evolved, becoming, one of the first set of precision measurements of the QCD at the LHC. This proceeding described the following measurements: inclusive jet cross section; dijet mass jet cross section; dijet azimuthal de-correlation; dijet production with a jet veto; multi cross sections.