The length would stay the same as the pressure inside the balloon equals the atmospheric pressure.
The air pressure inside the balloon will be slightly higher than outside. This is because the air inside the balloon is slightly compressed by the elasticity of the membrane of the balloon itself. By way of illustration, if you inflate a balloon, don't tie it and just let it go, then to everyones' amusement at parties the balloon flies crazily around the room until it is fully deflated! This fun aspect of balloons occurs as a result of the higher pressure inside the balloon escaping from the balloon to join the air in the room that is at normal pressure. Actually measuring the pressure inside the inflated balloon would require an experiment where the volume of pressurised air in the inflated balloon could be measured by a) measuring the volume of pressurised air inside the balloon by fully immersing the inflated balloon in a measuring receptacle full of water (with normal atmospheric pressure in the room pressing down on the surface of the water) and, then b) measuring the volume that the pressurised airinside the balloon would occupy once outside the balloon at normal atmospheric air pressure by inverting the measuring receptacle full of water (whilst held in a larger shallow tank of water so as to keep the measuring receptacle full of water once inverted - in the usual physics lab manner) and then release the air from the balloon into inverted water-filled measuring receptacle where it would gather in the top of the same. The difference in the two volumes would directly correlate with the difference in air pressure inside and outside the balloon.
If the balloon is filled with water, and the water freezes, the balloon will expand and may burst. This is because at temperatures below 4ºC, water begins to expand and as it turns to ice, it has a larger volume than when it was liquid.
Depends on the medium, and whether the ball is solid or not. A solid ball would float on mercury, sink in water. If it were hollow enough (or filled with, say, cork) it would float in water.
if it was empty and the hole is away from the water
The balloon would expand due to the lack of atmosphere on the moon, but it wouldn't burst because the pressure inside the balloon would equalize with the low pressure outside. Additionally, the balloon would float in the lower gravity environment of the moon.
I'd say that an inflated balloon would be strain, but could you specify what potential energy? Chemical potential? Gravitational potential?
The hot air balloon inflated as we went down to the ground. The water raft inflated as I jumped on it.
It would be easier to catch an inflated balloon because it is lighter and slower moving compared to a heavy cinder block. The balloon also has air inside it, which cushions its impact when caught.
The air would escape through the mouth causing the balloon to DEflate
Yes, the air in an inflated balloon has potential energy due to the elastic potential energy stored in the balloon's stretchy material. When the balloon is released, this potential energy is converted into kinetic energy as the air rushes out.
The length would stay the same as the pressure inside the balloon equals the atmospheric pressure.
Changes in air pressure
It would get smaller as the air inside the ballon contracted.
It could, if it contained enough air. To float on water, you would need about 1 liter of air for every kilogram you want to keep afloat.
No, because the atmosphere would pop the balloon.
The helium weighs less than air- so when the balloon is filled, it displaces the heavier air, and floats. Just as a bit of wood weighs less than water, and floats on water. In a vacuum, a helium filled balloon would not float (but it may pop)