One of these solutions is the hyperoncotic "Albumin 20%". However there are still many aspects of the physiological effects of hyperoncotic albumin, that are not known. In this study physiological effects will be studied in burn patients and healthy subjects. The colloid osmotic pressure and the increase of the plasma volume will be measured in 15 healthy subjects and in 15 burn patients. The effect on the plasma volume will be studied using hemoglobin as a marker of dilution. Colloids osmotic pressure and albumin concentration will be measured directly and urin production will also be measured. Blood samples will be collected during 4 to 5 hours to achieve a profile over the changes.