Constant Pressure Calorimeter

[Mariko Hashimoto 2I]

How does the constant pressure calorimeter account for a change in volume? When the temperature of the mixture is raised, how does it keep the pressure constant?

[Rainy Liu Ruoshui_2K]

According to the ideal gas law equation, PV = nRT. To respond to the changing temperature, the volume of the calorimeter can change to keep the pressure constant.

[Kaira Shibata 1E]

It accounts for the change in volume by the piston moving up, which increases the volume. This allows the pressure to remain constant. If the volume did not change, the pressure would increase and therefore no longer be constant.

[Rachel Fox - 3F]

The constant pressure calorimeter accounts for a change in volume by either having the calorimeter open or having a piston that is able to freely move. This means that when the temperature of the solution with the reactants increases, the volume of the solution will increase since pressure is kept constant by either having the open container or moveable piston. Work by expansion will be done since the air molecules are being moved in order for the system to remain at a constant pressure.

[205484435]

To keep the pressure constant, the piston is able to move up and therefore increases the volume, allowing the pressure to remain constant