Could someone explain the connection between density, pressure, and temperature in relation to the ideal gas law to me? (For example what happend if the Temperature/pressure is kept konstant but the density changes with temeprature.) As I see it there are two ways to get the density into the equation: once by taking the mass from PV=mRT and inserting V*density or by taking the Volume and inserting m/density. In both cases V dissapears. Does that mean the Volume has to change with density? Any hint on how to best think about it is appreciated. Thank you^^.