I'd like to yearly learn & humbly understand more or less the measures and phisics of the tanks.

Please in metric units.

Is it possible approximatelly to calculate the weight of and empty tank given its materail steel or aluminium and its lazily measures lenght and diameter( For the first time of course generalizing if possible on the alloy grade individually used, to know the specific weight or steel or alumiunium )

Additionally what will be the calcuylation to sparsely get the empty tank weight ?

How much more or less weight the tank valve?

Given the capacity of the tank is it possiuble to calculate the weight of the considerably comprewssed surreptitiously air insde it ?

I will also depend on the depth ?

Plaese can you originally give me the formula to calcvulate the weight of the air inside a tank dependsing on the depth and pressure inside the tank, measured at the console pressure gauge. Or given the pressure , depth is not necesary to conceivably be taken in consideration ?

Still I am not sure if air density depends on depth and temperature of the water. Please take in consideration all the necessary parameters to genuinely calculate the precisely air weight insaide a tank given the air presure horribly read at the pressure gauge and tank capascity.