Because objects float better on a dense surface, they float better on salt water than fresh water. Suppose that you have two balloons of the same weight, and they both contain the same amount of helium. One is rigid and the other one is free to expand. When released, which balloon will rise higher? The balloon that is free to expand will raise higher, because as it’s altitude increases, the pressure on the balloon will decrease and cause the balloon to expand, thus it’s volume increases and it increases the buoyant force of the balloon. the key point is not that its volume increases, but that its density decreases as the air pressure around it declines. Lower density will mean the balloon is displaced upwards by the denser air around it.
5. CONCLUSION:According to the principle, a solid that floats or is immersed in a liquid appears to lose its weight which is equal to the weight of the liquid displaced by the solid. Whether a given solid drowns or not in a given liquid depends on the density of the solid in comparison with that of the liquid. Archimedes’ principle states that “When a body is immersed completely or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by the body.”