Kidneys are a filter system. The main job of the kidneys is to remove waste from the blood and return the cleaned blood back to the body. Each minute about one litre of blood ï­ one-fifth of all the blood pumped by the heart - enters the kidneys through the renal arteries.
The volume of helium in the balloon has been estimated as being able to lift a total load, including the balloon material and the structure beneath it, of 65 pounds (29 kg) at sea level and 48 pounds (22 kg) at 8,000 feet (2,400 m).
Outside Air Temperature + Heat it Takes to Fly (140 F) = Temperature Inside the Balloon. Cold day of 30 degrees F + 140 F = 170 degrees inside the balloon. Hot day of 95 degrees F + 140 F = 235 degrees inside the balloon (more heat if it's hot out) This is of particular concern to companies operating smaller balloons.