Floor panel for forming a floor covering

A floor panel for forming a floor covering, comprising:

• a first pair of opposite edges, which form long edges of the floor panel, and a second pair of opposite edges, which form short edges of the floor panel;
• wherein both pairs of opposite edges comprise coupling parts, which allow that a plurality of such floor panels mutually can be coupled to each other;
• wherein these coupling parts, on both pairs of edges, form a first locking system, which, in a coupled condition of two of such floor panels, effects a locking in a plane of the two of such floor panels and perpendicular to the respective edges, and form a second locking system, which, in a coupled condition of two of such floor panels, effects a locking transverse to the plane of the two of such floor panels;
• wherein the coupling parts on the first pair of opposite edges substantially are formed from a material of the floor panel;
• wherein the coupling parts of at least the first pair of opposite edges are configured such that two of such floor panels can be coupled to each other at these edges by means of a turning movement and to this aim these coupling parts on the first pair of opposite edges consist of a tongue and a groove, and locking parts, which, in the coupled condition, prevent a shifting apart of the tongue and groove;
• wherein on the first pair of opposite edges the groove is bordered by a lower lip and an upper lip, of which the lower lip extends laterally up to beyond a distal extremity of the upper lip;
• wherein the locking parts of the first locking system on the first pair of edges are formed at least of a locking part on a lower side of the tongue and a locking part on the lower lip, which, by means of contact surfaces, which can cooperate with each other, result in the respective locking;
• wherein in a direction of the distal extremity of the tongue, at a same height H as the contact surfaces, a free space is present between the tongue and the opposite floor panel;
• wherein the floor panels on the first pair of edges, in a final coupled condition of two of such floor panels, are coupled in a horizontal direction free from play or, if such play indeed is present, it is less than 0.2 mm;
• wherein the coupling parts on the first pair of edges are configured such that during the turning into each other of two of such floor panels an elastic force has to be overcome during the turning movement, which force, during the turning into each other, first increases in order to subsequently decrease again;
• wherein the elastic force is delivered in that the locking parts on the tongue and groove are arranged during the turning movement to pass alongside each other exclusively by exerting a force upon each other;
• and
• wherein the elastic force substantially is the result of an elastic bending in the lower lip.