buoyancy
buoy.an.cy \'bo.i-*n-se-, 'bu:-y*n-\ n 1a: the tendency of a body to float or to rise when submerged in a fluid 1b: the power of a fluid to exert an upward force on a body placed in it 2: RESILIENCE, VIVACITY
Webster's English Dictionary Webster's English Dictionarybuoy.an.cy \'bo.i-*n-se-, 'bu:-y*n-\ n 1a: the tendency of a body to float or to rise when submerged in a fluid 1b: the power of a fluid to exert an upward force on a body placed in it 2: RESILIENCE, VIVACITY