The temperature experienced by the animal is dependent on the dry bulb temperature and RH. All animals lose heat to the environment by evaporation of moisture from the respiratory tract and through the skin. At higher RH, less evaporative loss occurs, increasing the chicks apparent temperature (the temperature that the chick feels) at a particular dry bulb temperature. Low RH will decrease apparent temperature so at low RH, the dry bulb temperature will need to be increased to account for this.