What is ppM and what is PPM used for?
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1. What is ppm? It is a unit of measurement that expresses relative values. Equivalent to a percentage rate. Now it's the parts per million ratio. 2. What is measured in ppm? 1) Some are used to indicate the ppm of the total number of defects included in the total number of deliveries. For example, if a product delivers a total of 1 million products every month (or every year, each batch...), and 10 products are found to be substandard, then the ppm is 10. If the total number is not 1 million pieces, it is converted into how many of the 1 million pieces are unqualified. How it should be measured can be determined through discussion with the customer, or it can be converted. For example, the ppm of the current month is accumulated to the ppm of the current month according to the month. According to the ppm of the batch, according to the cumulative ppm of the batch, according to the year... Of course, it can also be used to count ppm of the number of defective products in your own products. 2) Some are used to measure the content of impurities. For example, when 1 kilogram of solution is measured, 0.01 gram of impurity is found. Then, the impurity content is converted into parts per million, which is 10ppm. 3) To sum up, wherever percentages can be used, ppm can be used. Just do the math. 4) Why use ppm? In the past, when the quality was poor, percentages were sufficient. For example, the defective rate is 1% and the pass rate is 99%. Now the quality is better and it is no longer inconvenient. For example, if the defective rate is 0.0003% and the qualified rate is 99.9997%, it would be more convenient to use the defective rate of 3ppm. 5) Question. The above are all calculated based on the unit of the product. Use how many "pieces" there are in "pieces" (count type), or how many "grams" there are in "kilograms (kg)" (measurement type).
The host is so smart! Applying the very common unit of measurement "ppm" to quality management "quantifies" quality management.
Reply 2# ffgh0123 No, I downloaded this online. It seems to be Mechanical CAD. I am very angry today. I registered Mechanical CAD four years ago, but I have forgotten the name. I can't find it even if I have an email address. . . . Then I waited for a long time and couldn't register. . . (I have been waiting for two years, but registration is still closed) Haichuan is still better, and it is very popular. . . PPM is used in many places, but quality can also be used.
Reply 4# llyy0327 Yes, but PPM is used a lot in quality management, especially when counting the failure rate.
The original poster is so talented, PPM is actually used in quality management.
Reply 6# fanxh When I was studying quality management, the teacher I hired taught me about PPM for a long time, so I left a deep impression. Since I moved to the chemical industry, I often encountered PPM here, and I realized that everyone is familiar with it. But in the quality management of batch products, PPM is really important. In quality, it generally represents the defective rate per million.