In a sealed respirometer, what effect would decreasing the ambient temperature have on the pressure within the vial and the movement of water through the pipette? In a sealed respirometer, what effect would decreasing the ambient temperature have on the pressure within the vial and the movement of water through the pipette? Pressure would decrease and water would enter through the pipette. Pressure would decrease and water would leave through the pipette. Pressure would increase and water would leave through the pipette. Pressure would increase and water would enter through the pipette.