RFID tag for dumplings

    Hello, respectable ladies and gentlemen. Try to guess what is shown in the photo.
    This is not an art installation in the style of medical techno. This is a fully functional useful RFID device, the description of which is presented below.

    In fact, the picture shows the world's cheapest RFID temperature sensor (prototype, of course). A disposable syringe is filled with water. A stretched rope is passed through the serial RFID inlay (RFID tag). When the water in the syringe freezes, it expands, the syringe plunger pulls the rope even more, and the rope cuts the RFID tag. Accordingly, before the water was frozen, the RFID tag is read by the RFID reader, and after freezing, the RFID tag can no longer be read (perhaps never). Thus, using a standard RFID reader, you can remotely and quickly determine whether the lower limit of the storage temperature range of an object has been violated.

    A similar, but slightly more complex device can track the transition through the upper boundary of a certain temperature range. The prototype looks the same as in the photo above. Only inside the syringe is soda powder, citric acid powder and another small syringe filled with water to the eyeballs. When the object is stored in the desired temperature range, the water in the small syringe freezes, expands and completely pushes the piston of the small syringe. And inside a large syringe is a piece of ice sticking out of a small syringe. In this case, the shape of the large syringe remains the same. But when the temperature rises, the ice will begin to melt. Meltwater dissolves soda and citric acid, which immediately reacts chemically, releasing carbon dioxide. The gas acts on the piston of the external large syringe, and the RFID tag is out of order due to cutting the antenna with a rope. Accordingly, such a label will be remotely read until the upper range of the storage temperature of the object is exceeded.

    The benefit from this can be, for example, this: upon receipt of hundreds of boxes of dumplings, it is possible to determine in a minute which of them were thawed during transportation.

    It is clear that adding sodium chloride or C2H5OH to water, you can precisely set the freezing limit of water at temperatures below zero Celsius. But it would be nice to learn how to freeze a small amount of water at temperatures above zero. You can, of course, use heavy (deuterium) water, but this method is purely theoretical because of the high cost. English-speaking Google claims that the freezing point of water raises testosterone and fatty alcohols (long chain alcohol). I myself have never been a chemist, so I ask readers for help: is this fact true in principle, and how many degrees can the freezing point be raised. Can anyone know?

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