| CPC G01F 23/284 (2013.01) | 20 Claims |

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1. A method comprising:
receiving information regarding an initial state of a liquid in a container, the initial state comprising at least one of: an alcohol measure and a level of the liquid within the container;
monitoring a level of the liquid within the container, wherein the monitoring is performed external to the container;
determining an amount of loss of the liquid within the container based on the initial level and the monitored level; and
estimating the alcohol measure of liquid remaining within the container based on the determined amount of loss of the liquid.
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