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).
1 When the molecules of a gas are heated, they move faster. 2  The faster moving molecules inside the balloon push against the material the balloon is made out of. 3  This push from the inside air overcomes the inward pull of the balloon, making the balloon get bigger. When the bottle is cooled, the molecules inside the bottle move slower, the slower moving molecules inside the bottle push less hard against the bubble film, and the outside air overcomes the push from the inside air, forcing the bubble down.