Flow rate is diameter of hole*velocity, so the higher the velocity the higher the flow rate.
You can travel to places by your Balloon.
Physically it is impossible. The air would rush through the bottom of the balloon so quickly that it would fill up fast and pop quickly.
Yes
The gases filled within the balloon escape quickly.
If there were nothing inside the balloon - a vacuum - the balloon would quickly collapse due to the pressure of the atmosphere outside it. A firmer structure might resist the air pressure, but not a balloon.
Hot air rises more quickly than cold air, so when you heat the air inside the balloon, it cant escape, so it pushes the balloon up.
Sand sized particles.
because it snaps away from the other pieces quickly.
Because the balloon pops when the air inside the rushes out quickly through a tiny hole.
There is the weather balloon, and the zeppelin. Both use Helium, and no longer Hydrogen due to hydrogen's tendency to quickly catch fire.
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When you blow a balloon up with air and let it go it quickly releases its air and flys away very quickly until it lands on the ground