An ideal gas piston of
xm-o8z.gj65-qkq//nc/* nse s dffvr total volume $3900\,cm^3$ contains $3600\,cm^3$ of air and $3300\,cm^3$ of water at a temperature of $27^{\circ}C$. The system is cooled and the piston contracts at constant pressure.
What is the approximate total piston volume at the point where the water first starts to freeze?