The purpose of this study is to evaluate the relationship between the time needed to raise the oxygen concentration in patient's blood to 90% and his/or her body mass index. The prevalence of obesity in our society continues to rise. No studies have shown the time required for preoxygenation (oxygen given) in relation to body mass index (body weight in kg/height in meter2).
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Inclusion Criteria: * Participants between the ages of 18-50 years with no limitations as to gender or race * Participants classified as ASA 1 or 2 * Participants capable of understanding and signing an informed consent Exclusion Criteria: * Conditions which would affect their oxygenation such as heart disease, lung disease, anemia (Hemoglobin less than 12 g/dL) * History of smoking (smoking can affect pulmonary function and oxygen carrying capacity) * Acute substance abuse (substance abuse can affect respiratory function). * Maxillofacial abnormalities which would interfere with proper face mask seal.