The use of ultraviolet or fl uorescent dyes in an r-1234yf system is

Leak detection.

Explanation:

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Organic compounds such as r-1234yf (2,3,3,3-Tetrafluoropropene) are being used as new generation refrigerants for automobiles or cooling systems. Nonetheless, leaking is an issue present in most of the piping systems due to possibles crashes or design issues which turn out into the break of the system so the fluid flowing though it could escape out. To overcome this issue, ultraviolet or fluorescent dyes started being used to detect such escapes as they are visible either by the human or by an electronic detector allowing its further fix.

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14 days is the half-life of phosphorus-32

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying