| 摘要 |
A critical temperature indicator is provided using inexpensive molded vessels and filled with water sealed with a deformable membrane that will, upon reaching freezing, expand and cause the membrane coated with a transferable pigment to contact a spacer cap and give an irreversible indication. A critical temperature indicator is provided using molded inexpensive vessels filled with organic compounds that have a volume reduction as they undergo a change from the liquid state to a solid state. Either a spring-loaded diaphragm or a cylinder syringe-like assembly is used to move and show the volume change in conjunction with a transferable pigment to provide an irreversible color change when the organic compound turns into a solid. A dark pigmented rubber may be used instead of the transferable pigment so the device can be reversible.
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