Just a one- or two-degree change in temperature in a hot-air balloon, a few grams of ballast dropped, or a tiny release of gas will make a balloon ascend or descend accordingly.
Hydrogen provided the basic lift, while the hot-air balloon system allowed him to control his flight without having to constantly drop ballast or release gas.
At night, the balloon cools and must drop ballast to avoid drifting too low.
These balloons can only rise further by dropping ballast, unless they are a hybrid gas and hot air model.[25].
Dropping ballast, or any heavy object, over the side of the balloon will reduce the overall density of the balloon, and cause you to rise.
"It's time to drop the ballast of nuclear weapons and our party will soar," he said.
Most vehicles have numerous safety features, from manual override systems that allow divers to get into the cockpit to emergency ballast releases that can drop hundreds of pounds if the sub has trouble resurfacing.
The balloon climbed up to 21.6km in altitude by dropping the ballast and held out against a 64% pressure difference over the ambient atmosphere.
The current in the system was obtained by measuring the potential drop across the ballast resistor and electrode gap sequentially.
But keeping the AOL name until the investigations are closed leaves open the option of dropping it as ballast if the investigations tarnish it too badly, leaving the old name, Time Warner, relatively unsullied.
There isn't much talk and not a drop of cynicism in "Ballast," Lance Hammer's austerely elegant, emotionally unadorned riff on life and death in the Mississippi Delta.
