I think the correct word to fill in the blank is "no other source". <span>In terms of running the earth's atmospheric processes, the significant energy comes from the sun and no other source. Almost all of the energy in the Earth comes from the Sun and nothing else. Hope this helps.</span>
, a balloon filled with helium floats because of the air and helium density. Since the weight of helium is less than the wieight of air if you take the same volume of both, then the baloon will float. When you fill the balloon with helium, you need a helium pressure equal to that of air at the ground level. In order to know the air pressure on the ground level, you have to know the how high the atmosphere goes.
<span>The air pressure as in any fluid correspond to the next equation. </span>
<span>of course, the higher you get, the gravity's acceleration and profoundity will be lower, so the air pressure will be lower. </span>
<span>At certain height, the air that surrounds the balloon will be much lower than the pressure of the helium inside the balloon. This difference makes the helium make force to get out of the balloon and the bigger the difference of pressure, the bigger the force is. </span>
<span>When the force is big enough, the material of the balloon won't resist anymore and it will end up bursting. </span>
The density of pure water is 1 gram per 1 milliliter or one cubic cm. By knowing the density of water we can use it in dilution equations or to calculate the specific gravity of other solutions.
It can also help us determine what other substances are made of using the water displacement experiment. This is done by observing how much water is displaced when an object is submerged in the water. As long as you know the density of the water, the mass of the object being submerged and the volume of increase you can calculate the density of the object.
This was done by the great Archimedes in discovering what composed the kings crown.