I can't seem to find the answer to what should be a trivial question:
I have a rigid air-tight container of fixed volume and I am pumping air inside. The pressure is increasing (very slowly) from ~100kPa to ~50MPa - is the bulk modulus of air constant throughout the process or does it increase/decrease with increasing pressure?
I am assuming that the bulk modulus of gas should increase with increasing pressure as there is more force acting inside the gas (more gas molecules interactions) and the fluid itself is increasing in density.
Can you please offer any advice or reference me to some link.