Not to be confused with volume overload. Hypervolemia, or fluid overload, is the medical condition where there is too much fluid in the blood. The opposite condition is hypovolemia, which is too little fluid volume in the blood. Fluid volume excess in the intravascular compartment occurs due to an increase in total body sodium content and a consequent increase in extracellular body water.
The smell was put into natural Gas in the aftermath of a school explosion in New London Texas 1937. 300 students and faculty members lost their lives after the school exploded and was leveled when the trapped natural gas was ignited. The School was being fueled by gas directly from the near by oil wells.
Natural gas, which fuels your kitchen range, is odorless in its natural form. During the refining process, the chemical Mercaptan is added to the gas to give it its distinctive odor for safety purposes. Any leak can be dangerous, but not all leaks produce gas in a large enough volume to be detected by smell.