| 摘要 |
A disposable thermometer comprising a series of separate sealed chambers. A temperature-sensitive material fills each chamber and each is adapted to change from a solid to a liquid state when exposed to heat above a different predetermined temperature. A quantity of magnetic metal particles is suspended in each temperature-sensitive material. The particles in each chamber initially are poled in a common direction along different, substantially parallel lines so as to rapidly repel each other and move from parallel alignment as the temperature-sensitive material in which they are suspended begins to change to a liquid state thereby providing an accurate and visual indication that the thermometer has been exposed to heat above the predetermined temperature associated with the temperature-sensitive material.
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