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Water is transparent. Sunlight, or much of it, just passes through it. Wax is opaque. Sunlight that strikes it is mostly absorbed, warming the wax. So if a wax-based indicator is surrounded by water and placed in full sunlight, it is possible that the wax may get warmer than the water. So the indicator may show that a safe pasteurization temperature has been reached, when in fact the water is cooler. |
Water is transparent. Sunlight, or much of it, just passes through it. Wax is opaque. Sunlight that strikes it is mostly absorbed, warming the wax. So if a wax-based indicator is surrounded by water and placed in full sunlight, it is possible that the wax may get warmer than the water. So the indicator may show that a safe pasteurization temperature has been reached, when in fact the water is cooler. |
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+ | [[Special:Contributions/70.54.37.171|70.54.37.171]] 15:22, June 14, 2012 (UTC) |