Question

How the pressure of a system changes in terms of density?

Answer 1

Hendri Ong
if the fluid is saturated steam, the density (kg/m3) is higher by given higher pressure while the specific steam volume (m3/kg) is lower. 
if the fluid is cold water, the same temperature, no change in density. 
if the fluid is hot water, saturated, the density is higher by given higher pressure. 

Hope u understood