Odor intensity can decrease due to the presence of an absorbing substance on or in the pipe.

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Multiple Choice

Odor intensity can decrease due to the presence of an absorbing substance on or in the pipe.

Explanation:
Odor intensity is determined by the concentration of the odorant in the gas that reaches the end user. An absorbing substance on or in the pipe would have to remove odorant from the gas to lower that perceived odor, but in typical distribution systems, ordinary pipe materials do not noticeably remove odorant from the flow. Odor fade or reduced odor strength is usually due to dilution, improper odorant injection, or leaks, not adsorption by the pipe itself. Because this adsorption effect isn’t a reliable or expected reason for reduced odor in normal operation, the statement isn’t generally true.

Odor intensity is determined by the concentration of the odorant in the gas that reaches the end user. An absorbing substance on or in the pipe would have to remove odorant from the gas to lower that perceived odor, but in typical distribution systems, ordinary pipe materials do not noticeably remove odorant from the flow. Odor fade or reduced odor strength is usually due to dilution, improper odorant injection, or leaks, not adsorption by the pipe itself. Because this adsorption effect isn’t a reliable or expected reason for reduced odor in normal operation, the statement isn’t generally true.

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