A method for measuring the amount of a gas, such as carbon dioxide, dissolved in a liquid in a sealed thin-walled container without piercing the container or breaking the seal of the container. This is accomplished by deforming the thin-walled container by exerting a known force thereon, measuring the resulting deflection of the container, and measuring the ambient temperature of the liquid. By reference to a pre-calibrated chart, one can then find the amount of gas dissolved in the liquid at the known temperature and calculated pressure.