Methods of detecting overflow andor underflow events are provided. The material may be in the form of a sheet material or formed as a container such as a bag, pouch, or other suitable structure. The first arm assembly extends transverse to the second arm assembly. Electronics, sensors, or clocks adjacent to a hydrate are not only kept cool by the heat sinking effect of hydrate phase changes and evaporation of water that is released but, during phase changes, they are being kept at a constant temperature for extended periods of time, which further improves their stability. s at 106 s1 can be obtained in a surprising manner.