The present invention deals with determining the level of fluid in a container.
Typically, a beverage container containing a liquid will absorb heat energy from
the surrounding environment at a greater rate than a gaseous component in the headspace
of the beverage container. Thus, as the liquid is drawn from a beverage container
a greater headspace results. If a thermometric measuring device is employed along
the height of the beverage container the volume may be determined by observing
the difference in the temperature along the height of the beverage container. In
practice, a beer keg may exhibit a difference of as much as 9 degrees Fahrenheit
on the exterior surface of the beer keg when measured at the headspace as opposed
to the area where the liquid is present in the beverage container.
