Abstract: The present invention relates to a laundry washing machine (1) comprising a washing tub (3) external to a rotatable washing drum (4) adapted to receive laundry. The machine further comprises a level sensing device (19) having a pressure sensor (50) suitable for determining the liquid level inside the washing tub (3). The level sensing device (19) further comprises an air chamber (51; 151) connectable to a detection outlet (60) associated to the washing tub (3). A liquid flowing path (61) is defined between the detection outlet (60) and the air chamber (51; 151), wherein the liquid may flow between the washing tub (3) and the air chamber (51; 151).