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.
A gas leak can happen if a gas pipe is damaged, like if someone is digging a hole and accidentally breaks an underground gas line. Natural gas can also leak out if an appliance like a stove isn't hooked up right. When natural gas first comes out of the ground, you can't see it or smell it. That's why gas companies add a chemical, called mercaptan, which smells like rotten eggs to the gas to make even the smallest leaks easy to notice. Luckily, natural gas leaks are rare. Fires and explosions are even more uncommon because the rotten egg smell helps people get help quickly before anything bad happens.