The mass transfer coefficient for hydrogen sulfide emission from an aqueous solution and liquid manure into the air was determined using a convective emission chamber where air temperature, velocity, turbulence, and relative humidity were precisely controlled. The mass transfer coefficient was determined from experimental data and correlated to liquid temperature, air temperature, and air velocity using a dimensional analysis method. Typical values of air temperature (15-35 degrees C), air velocity (0.1-0.5 m/s), and liquid manure temperature (15-35 degrees C) in under-floor manure storage pits were used. The mass transfer coefficient increased as liquid temperature increased and decreased as the air velocity and air temperature increased. When the liquid temperature was higher than the air temperature, the mass transfer coefficient increased as the difference between the two temperatures increased. This result implies that a higher H2S emission rate is likely to occur in a situation where the liquid temperature is higher than the air temperature. Sensitivity analysis showed that the mass transfer coefficient is more sensitive to changes in liquid and air temperature than to air velocity above the liquid.