Well the quick answer is they only very rarely take off at night. They generally fly at dawn or dusk because at those times the winds are calmer, and will time it so that they can take off and land in daylight.
blue balloons fly in the air only on a Saturday night.
Balloons shrink on a cold night because the air inside them contracts as it cools down. This reduces the volume of air inside the balloon, causing it to shrivel up.
hot air balloons, etc.
Helium is the most used gas for balloons; sometimes hot air and rarely hydrogen.
They are filled with hot air. The hot air raises and take the balloon with it
Today hot air balloons are only for amusement.
Thanks to the many advances in physics and other sciences, hot air balloons are not only safer, but more efficient.
Only in water. The air from your mouth is the same density as the air in the room- they will not float in air.
air balloons or hot air balloons fly because they fill with a very light type of air. The air is hot air.
Balloons filled with helium float because helium is lighter than the surrounding air, creating a lifting force. This is known as buoyancy. Regular air-filled balloons are denser than the surrounding air and do not float.
Water balloons are typically made of thinner material than latex balloons, so they can hold less air in comparison. Also, water balloons are designed to hold water, not air, so they may burst if overinflated with air. Latex balloons are designed specifically for holding air and can typically hold more air than water balloons.
Only if you're The Wizard of Oz.