Suppose a 2 meter long pipe, with area of cross section is $1 m^2$. The pipe is vertically placed, with the bottom end closed. Inside the pipe, at the closed bottom end, there is $1 m^3$ of air, closed with a disc. This disc is movable, like a piston in a cylinder (the cylinder is the pipe).
Now, I'm pressing on the disc downwards and compressing the air to 5 bar of pressure (the volume of the air decreased).
Now I'm pouring water on to the disc, $1000$ $kg$ of water.
Now in the pipe,there is the compressed air at the very bottom, then the piston on it, and on the piston, filled with water of $1 m$ height ($1 m^3$ i.e., $1$ ton of weight).
If I release the pressure of the compressed air at the bottom very suddenly, UP TO WHAT HEIGHT will the water column will throw off(like a bullet)?
Consider the atmospheric pressure also, which is acting downwards,when it is shooting up..